Prevent launching client thread on exit

[Gavriliuk]

No description provided.

[codecov]

Codecov Report

Merging #2278 into master will increase coverage by 2.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2278      +/-   ##
==========================================
+ Coverage   71.35%   73.84%   +2.48%     
==========================================
  Files         138      137       -1     
  Lines       20205    21430    +1225     
==========================================
+ Hits        14418    15825    +1407     
+ Misses       5787     5605     -182     

Impacted Files	Coverage Δ
src/unix/rtMutexNative.cpp	85.71% <0.00%> (-14.29%)	⬇️
examples/pxScene2d/src/pxImageA.cpp	72.99% <0.00%> (-10.25%)	⬇️
src/rtThreadPool.cpp	77.77% <0.00%> (-9.73%)	⬇️
src/unix/rtThreadPoolNative.cpp	70.83% <0.00%> (-5.29%)	⬇️
src/pxRect.h	51.06% <0.00%> (-4.94%)	⬇️
examples/pxScene2d/src/pxFont.cpp	73.35% <0.00%> (-4.82%)	⬇️
src/rtFileDownloader.cpp	66.76% <0.00%> (-4.60%)	⬇️
src/rtHttpCache.cpp	78.76% <0.00%> (-3.98%)	⬇️
src/rtScriptV8/jsCallback.cpp	85.07% <0.00%> (-3.64%)	⬇️
examples/pxScene2d/src/pxText.cpp	67.82% <0.00%> (-3.27%)	⬇️
... and 119 more

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[Gavriliuk]

Duplicates #2277