Fix coverage-ld.c on systems with an Android linker in $PATH

Summary:
On my system, clang tries to invoke /path/to/arm-linux-androideabi-ld
as the linker for Android, and the regex inside the test file considers
this as unacceptable.

Reviewers: samsonov

Subscribers: tberghammer, aemerson, cfe-commits

Differential Revision: http://reviews.llvm.org/D8598

llvm-svn: 233211