Remove RCS from list of VCS names to ignore #1748

[JonoYang]

This just removes RCS from the list of VCS-related directory names in commoncode/ignore.py

Let me know if anything else should be removed also

[codecov]

Codecov Report

Merging #1766 into develop will decrease coverage by 0.1%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1766      +/-   ##
===========================================
- Coverage     78.5%   78.39%   -0.11%     
===========================================
  Files          131      131              
  Lines        16736    16736              
===========================================
- Hits         13138    13121      -17     
- Misses        3598     3615      +17

Impacted Files	Coverage Δ
src/commoncode/ignore.py	74.35% <ø> (ø)	⬆️
src/summarycode/generated.py	72.54% <0%> (-9.81%)	⬇️
src/licensedcode/cache.py	79.57% <0%> (-7.05%)	⬇️
src/typecode/pygments_lexers.py	52.25% <0%> (-0.65%)	⬇️
src/scancode/api.py	92.4% <0%> (-0.64%)	⬇️

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[pombredanne]

LGTM! merging.