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   

[helly25]

Hi — since upstream has been quiet for a while, the fork at https://github.com/helly25/bazel-compile-commands-extractor has picked up this change as part of a viability sweep.

Backported (with attribution preserved in the commit message) in helly25#7. Thanks for the original patch.