test/CodeGen/sse-builtins.c: Make this host-independent to unbreak posix-unlike hosts.

Without -ffreestanding, clang tries to seek /usr/include/stdlib.h in host filesystem, even on Windows hosts.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@139899 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed