build: meson: sync locations with autotools
Autotools, probably due to historic reasons, creates the following files:
($prefix = /usr)
Before this patch meson used not /usr/lib/ but $libdir, and $libdir is /usr/lib on a few Linux distros, e.g. Arch Linux, but it is /usr/lib64 on many 64-bit Linux distros using biarch, including ROSA, ALT, Fedora, SUSE etc., and is /usr/lib/$arch on multiarch systems (e.g. Debian).
So, switching from autotools to meson relocated /usr/lib/polkit-1/* to /usr/lib64/polkit-1/ on ROSA. This relocation does not make sense to my mind, $libexecdir, which is /usr/libexec on ROSA and Fedora and sometimes is /usr/lib (e.g. in ALT Linux), would be a better place for those executable binaries (and also relocation may require adjusting SELinux policy).
Also, that probably breaks polkit because /usr/lib/polkit-1/ is hardcoded:
src/polkitagent/polkitagentsession.c:599: helper_argv = PACKAGE_PREFIX "/lib/polkit-1/polkit-agent-helper-1";
I suspected that some external programs may rely on /usr/lib/polkit-1/, but searching for "lib/polkit-1" on http://codesearch.debian.net did not find such programs.
For now let's just use the old location in meson. Later a switch to $libexecdir can be done.
Signed-off-by: Mikhail Novosyolov email@example.com