test/PECOFF: Remove REQUIRES: system-windows

These tests run fine on non-windows platforms too. Instead I add
REQUIRES: lld, as that is what they really require.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@358499 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed