[compiler-rt] [test] Mark a windows specific test as requiring an MSVC like environment

This test relies on MSVC style linking details, such as -Wl,-dll
(which could be expressed with just "-shared", which would work
with MinGW too) and an implicitly created import library named
"<basename>.lib" (which isn't created when linking in MinGW mode).

This fixes running the compiler-rt tests in MinGW environments.