Skip rtmp2segment logic for Windows.

[leszko]

It broke the Windows builds and is not used anywhere other than Realtime Video AI.

CC: @j0sh I think you'll need to implement that part for Windows too at some point.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.96839%. Comparing base (3b1b600) to head (9323ce1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3239         +/-   ##
===================================================
+ Coverage   34.96560%   34.96839%   +0.00279%     
===================================================
  Files            135         135                 
  Lines          35901       35901                 
===================================================
+ Hits           12553       12554          +1     
+ Misses         22642       22641          -1     
  Partials         706         706                 

Files with missing lines	Coverage Δ
media/rtmp2segment.go	0.00000% <ø> (ø)

... and 1 file with indirect coverage changes

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Files with missing lines	Coverage Δ
media/rtmp2segment.go	0.00000% <ø> (ø)

... and 1 file with indirect coverage changes

[rickstaa]

LGTM!