libobs: Fix duplicate symbol resolution for obs plugins

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By default duplicate non-static symbols loaded by dynamic libraries are
de-duplicated by the dynamic library loader. This can lead to issues
with statically linked libraries inside obs plugins if the symbols
share their signature: Whichever plugin is loaded first gets to "set"
the symbol (which can become problematic especially for C++ template
functions).

Using RTLD_LOCAL ensures that all symbols are hidden and can only be
explicitly loaded using dlsym() which avoids this issue.

Unfortunately due to the way scripting works in obs-studio, Python
still needs to be loaded with RTLD_GLOBAL, hence the branch in the fix.

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