[ASan] Add aligned_alloc declaration to aligned_alloc-alignment.cc test.

aligned_alloc is not always defined in headers.

Differential Revision: https://reviews.llvm.org/D44404

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@328726 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed