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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38560 3c298f89-4303-0410-b956-a3cf2f4a3e73