build: fix build on Mac OS X 10.9

Add a wrapper around the clang gcc emulation to fix -print-file-name=<lib>

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 38560

scripts/clang-gcc-wrapper

@@ -0,0 +1,12 @@
+#!/bin/sh
+_cc="${HOSTCC_REAL:-gcc}"
+case "$1" in
+	-print-file-name=*)
+		dirs="$($_cc -print-search-dirs | grep -m1 libraries | sed -e 's,:, ,' -e 's,.* =,,')"
+		dirs="$dirs /usr/lib /usr/local/lib"
+		find $dirs -name "${1#*=}" | head -n1
+	;;
+	*)
+		exec $_cc "$@"
+	;;
+esac