Link /rustroot/lib stuff for clang -m32 to see

Author: cuviper

src/ci/docker/host-x86_64/dist-x86_64-linux/build-gcc.sh

@@ -39,3 +39,8 @@ ln -s gcc /rustroot/bin/cc
 cd ..
 rm -rf gcc-build
 rm -rf gcc-$GCC
+
+# FIXME: clang doesn't find 32-bit libraries in /rustroot/lib,
+# but it does look all the way under /rustroot/lib/[...]/32,
+# so we can link stuff there to help it out.
+ln /rustroot/lib/*.{a,so} -rst /rustroot/lib/gcc/x86_64-pc-linux-gnu/$GCC/32/