setupext.py: let the user set a different pkg-config #4807
Merged
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Use the environment variable PKG_CONFIG to determine the correct
pkg-config executable. Default to 'pkg-config' if the variable is not
set.
This allows the user to cross compile. E.g., PKG_CONFIG can be set to
'x86_64-pc-linux-gnu-pkg-config'.
I did not touch any windows specific functions, which still call
'pkg-config' directly.