Add support for -- on clang/clang-cl command-line

[glandium]

Fixes #1498

[codecov-commenter]

Codecov Report

Attention: 135 lines in your changes are missing coverage. Please review.

Comparison is base (68d0409) 30.69% compared to head (8aed3f0) 30.97%.

Files	Patch %	Lines
src/compiler/msvc.rs	39.28%	21 Missing and 47 partials ⚠️
src/compiler/gcc.rs	40.59%	6 Missing and 54 partials ⚠️
src/compiler/args.rs	57.14%	0 Missing and 6 partials ⚠️
src/compiler/c.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1983      +/-   ##
==========================================
+ Coverage   30.69%   30.97%   +0.27%     
==========================================
  Files          51       51              
  Lines       19192    19392     +200     
  Branches     9230     9330     +100     
==========================================
+ Hits         5891     6006     +115     
- Misses       7760     7763       +3     
- Partials     5541     5623      +82     

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