Add compilers to R recipes

[marcelotrevisani]

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[codecov-commenter]

Codecov Report

Merging #424 (95e3bbe) into main (9c3242e) will increase coverage by 0.48%.
The diff coverage is 92.48%.

@@            Coverage Diff             @@
##             main     #424      +/-   ##
==========================================
+ Coverage   91.30%   91.79%   +0.48%     
==========================================
  Files          17       17              
  Lines        1576     1938     +362     
==========================================
+ Hits         1439     1779     +340     
- Misses        137      159      +22     

Flag	Coverage Δ
unittests	91.79% <92.48%> (+0.48%)	⬆️

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Impacted Files	Coverage Δ
setup.py	0.00% <0.00%> (ø)
grayskull/base/github.py	72.83% <72.83%> (ø)
grayskull/license/discovery.py	93.81% <72.97%> (-3.33%)	⬇️
grayskull/strategy/abstract_strategy.py	83.33% <83.33%> (ø)
grayskull/strategy/cran.py	90.20% <90.20%> (ø)
grayskull/base/factory.py	90.69% <92.30%> (+0.69%)	⬆️
grayskull/__main__.py	93.49% <92.94%> (-4.66%)	⬇️
grayskull/strategy/py_base.py	95.43% <95.43%> (ø)
grayskull/utils.py	98.12% <97.58%> (-1.88%)	⬇️
grayskull/strategy/pypi.py	97.68% <97.68%> (ø)
... and 9 more

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