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/tools/text/sgml/opensp/setup-hook.sh

@@ -0,0 +1,22 @@
+addSGMLCatalogs () {
+      if test -d $1/sgml/dtd; then
+          for i in $(find $1/sgml/dtd -name docbook.cat); do
+              export SGML_CATALOG_FILES="${SGML_CATALOG_FILES:+:}$i"
+          done
+      fi
+}
+
+if test -z "${sgmlHookDone-}"; then
+    sgmlHookDone=1
+
+    # Set http_proxy and ftp_proxy to a invalid host to prevent
+    # xmllint and xsltproc from trying to download DTDs from the
+    # network even when --nonet is not given.  That would be impure.
+    # (Note that .invalid is a reserved domain guaranteed not to
+    # work.)
+    export http_proxy=http://nodtd.invalid/
+    export ftp_proxy=http://nodtd.invalid/
+
+    export SGML_CATALOG_FILES
+    addEnvHooks "$targetOffset" addSGMLCatalogs
+fi