[core]: Fix name conflict with md5 functions

[Biswa96]

This renames the private md5 functions by adding srt_ prefix.
Otherwise, the md5 functions are shown as multiple definition
while static linking in presence of other libraries.

[codecov-commenter]

Codecov Report

Merging #2301 (705fb4a) into master (1cd39b9) will decrease coverage by 0.02%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master    #2301      +/-   ##
==========================================
- Coverage   65.78%   65.76%   -0.03%     
==========================================
  Files          95       95              
  Lines       19524    19524              
==========================================
- Hits        12843    12839       -4     
- Misses       6681     6685       +4     

Impacted Files	Coverage Δ
srtcore/md5.cpp	92.24% <87.50%> (ø)
srtcore/common.cpp	38.24% <100.00%> (ø)
srtcore/list.cpp	76.71% <0.00%> (-4.94%)	⬇️
test/test_bonding.cpp	97.84% <0.00%> (-0.54%)	⬇️
srtcore/api.cpp	51.55% <0.00%> (-0.11%)	⬇️
srtcore/core.cpp	59.81% <0.00%> (+0.09%)	⬆️
srtcore/buffer.cpp	66.76% <0.00%> (+0.57%)	⬆️
srtcore/queue.cpp	80.84% <0.00%> (+1.16%)	⬆️
srtcore/congctl.cpp	80.72% <0.00%> (+1.56%)	⬆️

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[maxsharabayko]

Hi @Biswa96
Thank you for the PR. Indeed a good fix. I would rather suggest putting those functions inside the srt namespace instead of renaming them.

(Related issue #1924)

[Biswa96]

Done.