component/glib: make build depend on python version
We should not use $PYTHON, because this implicitly depends on the python version that was used when the shared part is installed, leading to this kind of problematic scenarios: - install the part from a python2.7 software, this creates scripts with "python2.7" in shebang line - install a python3 software referencing glib, it uses the shared part that was installed with python2, but "python2.7" is not in $PATH By referencing the part explicitly, it becomes part of the signature of the part, so a software on python2 and a software on python3 will use a different version of the shared part.
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