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/servers/coturn/default.nix

@@ -0,0 +1,55 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, fetchpatch
+, openssl
+, libevent
+, pkg-config
+, libprom
+, libpromhttp
+, libmicrohttpd
+, nixosTests
+}:
+
+stdenv.mkDerivation rec {
+  pname = "coturn";
+  version = "4.5.2";
+
+  src = fetchFromGitHub {
+    owner = "coturn";
+    repo = "coturn";
+    rev = version;
+    sha256 = "1s7ncc82ny4bb3qkn3fqr0144xsr7h2y8xmzsf5037h6j8f7j3v8";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [
+    openssl
+    libevent
+    libprom
+    libpromhttp
+    libmicrohttpd
+  ];
+
+  patches = [
+    ./pure-configure.patch
+  ];
+
+  # Workaround build failure on -fno-common toolchains like upstream
+  # gcc-10. Otherwise build fails as:
+  #   ld: ...-libprom-0.1.1/include/prom_collector_registry.h:37: multiple definition of
+  #     `PROM_COLLECTOR_REGISTRY_DEFAULT'; ...-libprom-0.1.1/include/prom_collector_registry.h:37: first defined here
+  # Should be fixed in libprom-1.2.0 and later: https://github.com/digitalocean/prometheus-client-c/pull/25
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
+  passthru.tests.coturn = nixosTests.coturn;
+
+  meta = with lib; {
+    homepage = "https://coturn.net/";
+    license = with licenses; [ bsd3 ];
+    description = "A TURN server";
+    platforms = platforms.all;
+    broken = stdenv.isDarwin; # 2018-10-21
+    maintainers = with maintainers; [ ralith _0x4A6F ];
+  };
+}

pkgs/servers/coturn/pure-configure.patch

@@ -0,0 +1,17 @@
+diff --git a/configure b/configure
+index 28a0625..ea25488 100755
+--- a/configure
++++ b/configure
+@@ -624,12 +624,6 @@ fi
+ 
+ TMPDIR="."
+ 
+-if [ -d /var/tmp ] ; then
+-  TMPDIR="/var/tmp"
+-elif [ -d /tmp ] ; then
+-  TMPDIR=/tmp
+-fi
+-
+ ${ECHO_CMD} Use TMP dir ${TMPDIR}
+ 
+ #########################