build: in the ccache case, after test -e also accept -L

for compiler frontends, they might be absolute links to
/etc/alternatives and then the test might just not work
in the chroot case (problem of the BUILD_ROOT prefix)

Author: bugfinder

build

@@ -594,7 +594,7 @@ ccache_setup() {
 	if mkdir -p $BUILD_ROOT/var/lib/build/ccache/bin; then
 	    for i in $(ls $BUILD_ROOT/usr/bin | grep -E '^(cc|gcc|[cg][+][+]|clang|clang[+][+])([-]?[.0-9])*$'); do
 		rm -f $BUILD_ROOT/var/lib/build/ccache/bin/$i
-		test -e $BUILD_ROOT/usr/bin/$i || continue
+		test -e $BUILD_ROOT/usr/bin/$i -o -L $BUILD_ROOT/usr/bin/$i || continue
 		echo '#! /bin/sh' > $BUILD_ROOT/var/lib/build/ccache/bin/$i
 		echo "test -e /usr/bin/$i || exit 1" >> $BUILD_ROOT/var/lib/build/ccache/bin/$i
 		echo 'export PATH=/usr/lib/icecc/bin:/opt/icecream/bin:/usr/bin:$PATH' >> $BUILD_ROOT/var/lib/build/ccache/bin/$i