SRT build from source code

[xiaozhihong]

1. add srt-1.4.1.tar.gz
2. modify configure and auto/depend.sh
3. add centos7/8 ubuntu16/18/20 build SRT workflow.

[codecov-commenter]

Codecov Report

Merging #2357 (13969ab) into 4.0release (262f0fc) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           4.0release    #2357      +/-   ##
==============================================
- Coverage       38.44%   38.44%   -0.01%     
==============================================
  Files             109      109              
  Lines           39954    39954              
==============================================
- Hits            15360    15359       -1     
- Misses          24594    24595       +1     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/protocol/srs_service_utility.cpp | 72.43% <0.00%> (-0.55%) | ⬇️ |

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Translated to English while maintaining the markdown structure:

'> Δ = absolute <relative> (impact), ø = not affected, ? = missing data

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TRANS_BY_GPT3

[winlinvip]

Merged in:

90f1b482a
SRT: Build SRT from source by SRS. 4.0.115