fix: skip .S compiles for msvc/windows

[zaucy]

I was getting this error while compiling libraries that use .S as input files which run through msvc masm compiler. Just adding the skip works for me.

AssertionError: Something went wrong in makefile parsing to get headers. The target should be an object file. Output: MASM : warning A4018:invalid command-line option : /bigobj MASM : warning A4018:invalid command-line option : /Zm500 MASM : warning A4018:invalid command-line option : /Z500 MASM : warning A4018:invalid command-line option : /Z00 MASM : warning A4018:invalid command-line option : /Z0 MASM : warning A4018:invalid command-line option : /EHsc MASM : warning A4018:invalid command-line option : /wd4351 MASM : warning A4018:invalid command-line option : /wd4291 MASM : warning A4018:invalid command-line option : /wd4250 MASM : warning A4018:invalid command-line option : /wd4996 MASM : warning A4018:invalid command-line option : /showIncludes Assembling: bazel-out/x64_windows-fastbuild/bin/external/boost.context+/src/asm/jump_x86_64_ms_pe_masm.S bazel-out/x64_windows-fastbuild/bin/external/boost.context+/src/asm/jump_x86_64_ms_pe_masm.S(1) : fatal error A1000:cannot open file : bazel-out/x64_windows-fastbuild/bin/external/boost.context+/_objs/boost.context/jump_x86_64_ms_pe_masm.obj