Build fixes

[disa6302]

Issue #, if available:

What was changed?

• Adding threadpool to ensure it is installed along with other webrtc libraries
• Removing the unnecessary linkage to stun, rtp and sdp libraries in samples since we do not directly use its APIs

Why was it changed?

• Threadpool was added to ensure custom path install works for threadpool and does not cause linkage failure.

How was it changed?

• Check the cmake file changes made in the PR

What testing was done for the changes?

• Allowing CI to run to ensure this does not break anything
• Ran local build by setting OPEN_SRC_INSTALL_PREFIX and CMAKE_INSTALL_PREFIX paths.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.63%. Comparing base (cae3c67) to head (aa53fd1).

❗ Current head aa53fd1 differs from pull request most recent head 86c1ca3

Please upload reports for the commit 86c1ca3 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2009      +/-   ##
===========================================
- Coverage    88.65%   88.63%   -0.03%     
===========================================
  Files           48       48              
  Lines        12714    12714              
===========================================
- Hits         11272    11269       -3     
- Misses        1442     1445       +3     

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[hassanctech]

lgtm

[niyatim23]

Nice!

[hassanctech]

lgtm