add /usr/bin to PYTHONPATH #1026

Job	Run time
pack_pip	19s
pack_rpm (fedora, 34)	1m 6s
pack_deb	2m 38s
pack_rpm (fedora, 35)	1m 6s
pack_rpm (fedora, 36)	1m 2s
run_tests_pip_package_windows	8m 31s
run_tests_pip_package_linux	2m 26s
run_tests_rpm (fedora, 34)	4m 47s
run_tests_rpm (fedora, 35)	4m 43s
run_tests_rpm (fedora, 36)	4m 44s
run_tests_deb (debian, bookworm)	1m 27s
run_tests_deb (ubuntu, focal)	3m 49s
run_tests_deb (ubuntu, jammy)	3m 49s
run_tests_deb (ubuntu, noble)	4m 15s
publish_rpm	0s
publish_deb	0s
publish_pip	0s
	44m 42s

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