How to fix these warnings for future runs of rpmbuild?
 

Can warnings like these be fixed automagically during the time that rpmbuild runs?

Warning: unused libraries in /usr/share/discord/libEGL.so: libpthread.so.0

Warning: unused libraries in /usr/share/discord/libGLESv2.so: libpthread.so.0

Warning: unused libraries in /usr/share/discord/libvk_swiftshader.so: libpthread.so.0

Warning: unused libraries in /usr/share/discord/swiftshader/libEGL.so: libpthread.so.0

Warning: unused libraries in /usr/share/discord/swiftshader/libGLESv2.so: libpthread.so.0

Warning: unused libraries in /usr/share/discord/Discord: libpthread.so.0

Warning: undefined symbols in /usr/share/discord/libEGL.so:
Warning: undefined symbols in /usr/share/discord/libGLESv2.so:
Warning: undefined symbols in /usr/share/discord/libffmpeg.so:
Warning: undefined symbols in /usr/share/discord/libvk_swiftshader.so:
Warning: undefined symbols in /usr/share/discord/swiftshader/libEGL.so:
Warning: undefined symbols in /usr/share/discord/swiftshader/libGLESv2.so:

I have searched to find what I can do to fix it, but no page I've found so far don't really have this specific fix.

I guess (I'm not an expert) that this might be a linking issue.

Am I right?

[obviously] we have no any idea what are you trying to build. Therefore extremely hard to tell you how to fix it.