GDB Refactor [6/N]: Move gcc.py into lib/

[gsingh93]

Moved gcc.py to lib/gcc.py. Added an underscore to the module private functions. which now takes a pwndbg.lib.Arch, and I've added a typehint there to make that clear.

[codecov-commenter]

Codecov Report

Merging #1124 (7bd4347) into dev (77380eb) will decrease coverage by 0.00%.
The diff coverage is 53.55%.

@@            Coverage Diff             @@
##              dev    #1124      +/-   ##
==========================================
- Coverage   50.23%   50.23%   -0.01%     
==========================================
  Files         168      171       +3     
  Lines       19867    19869       +2     
  Branches     1813     1812       -1     
==========================================
+ Hits         9981     9982       +1     
- Misses       9550     9551       +1     
  Partials      336      336              

Impacted Files	Coverage Δ
pwndbg/commands/comments.py	39.47% <0.00%> (ø)
pwndbg/commands/flags.py	37.03% <0.00%> (ø)
pwndbg/commands/procinfo.py	24.61% <0.00%> (ø)
pwndbg/commands/radare2.py	40.47% <0.00%> (ø)
pwndbg/disasm/jump.py	44.44% <0.00%> (ø)
pwndbg/lib/abi.py	93.33% <ø> (ø)
pwndbg/lib/android.py	0.00% <ø> (ø)
pwndbg/lib/funcparser.py	16.66% <ø> (ø)
pwndbg/lib/functions.py	100.00% <ø> (ø)
pwndbg/lib/which.py	52.00% <ø> (ø)
... and 49 more

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