uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/build-support/wrapper-common/utils.bash

@@ -0,0 +1,166 @@
+# Accumulate suffixes for taking in the right input parameters with the `mangle*`
+# functions below. See setup-hook for details.
+accumulateRoles() {
+    declare -ga role_suffixes=()
+    if [ "${NIX_@wrapperName@_TARGET_BUILD_@suffixSalt@:-}" ]; then
+        role_suffixes+=('_FOR_BUILD')
+    fi
+    if [ "${NIX_@wrapperName@_TARGET_HOST_@suffixSalt@:-}" ]; then
+        role_suffixes+=('')
+    fi
+    if [ "${NIX_@wrapperName@_TARGET_TARGET_@suffixSalt@:-}" ]; then
+        role_suffixes+=('_FOR_TARGET')
+    fi
+}
+
+mangleVarListGeneric() {
+    local sep="$1"
+    shift
+    local var="$1"
+    shift
+    local -a role_suffixes=("$@")
+
+    local outputVar="${var}_@suffixSalt@"
+    declare -gx "$outputVar"+=''
+    # For each role we serve, we accumulate the input parameters into our own
+    # cc-wrapper-derivation-specific environment variables.
+    for suffix in "${role_suffixes[@]}"; do
+        local inputVar="${var}${suffix}"
+        if [ -v "$inputVar" ]; then
+            export "${outputVar}+=${!outputVar:+$sep}${!inputVar}"
+        fi
+    done
+}
+
+mangleVarList() {
+    mangleVarListGeneric " " "$@"
+}
+
+mangleVarBool() {
+    local var="$1"
+    shift
+    local -a role_suffixes=("$@")
+
+    local outputVar="${var}_@suffixSalt@"
+    declare -gxi "${outputVar}+=0"
+    for suffix in "${role_suffixes[@]}"; do
+        local inputVar="${var}${suffix}"
+        if [ -v "$inputVar" ]; then
+            # "1" in the end makes `let` return success error code when
+            # expression itself evaluates to zero.
+            # We don't use `|| true` because that would silence actual
+            # syntax errors from bad variable values.
+            let "${outputVar} |= ${!inputVar:-0}" "1"
+        fi
+    done
+}
+
+# Combine a singular value from all roles. If multiple roles are being served,
+# and the value differs in these roles then the request is impossible to
+# satisfy and we abort immediately.
+mangleVarSingle() {
+    local var="$1"
+    shift
+    local -a role_suffixes=("$@")
+
+    local outputVar="${var}_@suffixSalt@"
+    for suffix in "${role_suffixes[@]}"; do
+        local inputVar="${var}${suffix}"
+        if [ -v "$inputVar" ]; then
+            if [ -v "$outputVar" ]; then
+                if [ "${!outputVar}" != "${!inputVar}" ]; then
+                    {
+                        echo "Multiple conflicting values defined for $outputVar"
+                        echo "Existing value is ${!outputVar}"
+                        echo "Attempting to set to ${!inputVar} via $inputVar"
+                    } >&2
+
+                    exit 1
+                fi
+            else
+                declare -gx ${outputVar}="${!inputVar}"
+            fi
+        fi
+    done
+}
+
+skip () {
+    if (( "${NIX_DEBUG:-0}" >= 1 )); then
+        echo "skipping impure path $1" >&2
+    fi
+}
+
+
+# Checks whether a path is impure.  E.g., `/lib/foo.so' is impure, but
+# `/nix/store/.../lib/foo.so' isn't.
+badPath() {
+    local p=$1
+
+    # Relative paths are okay (since they're presumably relative to
+    # the temporary build directory).
+    if [ "${p:0:1}" != / ]; then return 1; fi
+
+    # Otherwise, the path should refer to the store or some temporary
+    # directory (including the build directory).
+    test \
+        "$p" != "/dev/null" -a \
+        "${p#${NIX_STORE}}"     = "$p" -a \
+        "${p#${NIX_BUILD_TOP}}" = "$p" -a \
+        "${p#/tmp}"             = "$p" -a \
+        "${p#${TMP:-/tmp}}"     = "$p" -a \
+        "${p#${TMPDIR:-/tmp}}"  = "$p" -a \
+        "${p#${TEMP:-/tmp}}"    = "$p" -a \
+        "${p#${TEMPDIR:-/tmp}}" = "$p"
+}
+
+expandResponseParams() {
+    declare -ga params=("$@")
+    local arg
+    for arg in "$@"; do
+        if [[ "$arg" == @* ]]; then
+            # phase separation makes this look useless
+            # shellcheck disable=SC2157
+            if [ -x "@expandResponseParams@" ]; then
+                # params is used by caller
+                #shellcheck disable=SC2034
+                readarray -d '' params < <("@expandResponseParams@" "$@")
+                return 0
+            fi
+        fi
+    done
+}
+
+checkLinkType() {
+    local arg
+    type="dynamic"
+    for arg in "$@"; do
+        if [[ "$arg" = -static ]]; then
+            type="static"
+        elif [[ "$arg" = -static-pie ]]; then
+            type="static-pie"
+        fi
+    done
+    echo "$type"
+}
+
+# When building static-pie executables we cannot have rpath
+# set. At least glibc requires rpath to be empty
+filterRpathFlags() {
+    local linkType=$1 ret i
+    shift
+
+    if [[ "$linkType" == "static-pie" ]]; then
+        while [[ "$#" -gt 0 ]]; do
+            i="$1"; shift 1
+            if [[ "$i" == -rpath ]]; then
+                # also skip its argument
+                shift
+            else
+                ret+=("$i")
+            fi
+        done
+    else
+        ret=("$@")
+    fi
+    echo "${ret[@]}"
+}