get original client ip instead of proxy ip, for rtc api

[duiniuluantanqin]

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[codecov-commenter]

Codecov Report

Merging #2514 (ec790b3) into develop (06f10b1) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #2514      +/-   ##
===========================================
- Coverage    42.70%   42.70%   -0.01%     
===========================================
  Files          102      102              
  Lines        36058    36064       +6     
===========================================
  Hits         15400    15400              
- Misses       20658    20664       +6     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_rtc_api.cpp | 0.00% <0.00%> (ø) | |'

Translated to English while maintaining the markdown structure:

| trunk/src/app/srs_app_rtc_api.cpp | 0.00% <0.00%> (ø) | |
| trunk/src/protocol/srs_service_utility.cpp | 72.43% <0.00%> (-0.55%) | ⬇️ |
| trunk/src/protocol/srs_rtmp_handshake.cpp | 84.13% <0.00%> (+0.17%) | ⬆️ |

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

Translated to English while maintaining the markdown structure:

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

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