fix: add path for lib64 pkgconfig for version-checking

[kada49]

Describe your PR, what does it fix/add?

Fedora Linux uses /usr/lib64 for 64-bit shared libraries. Because of that the pkgconfig dir on Fedora is /usr/lib64/pkgconfig.

This fixes hyprctl version from:

Libraries:
Hyprgraphics: built against 0.5.0, system has unknown
Hyprutils: built against 0.12.0, system has unknown
Hyprcursor: built against 0.1.13, system has unknown
Hyprlang: built against 0.6.8, system has unknown
Aquamarine: built against 0.10.0, system has unknown

to

Libraries:
Hyprgraphics: built against 0.5.1, system has 0.5.1
Hyprutils: built against 0.12.0, system has 0.12.0
Hyprcursor: built against 0.1.13, system has 0.1.13
Hyprlang: built against 0.6.8, system has 0.6.8
Aquamarine: built against 0.10.0, system has 0.10.0

Is it ready for merging, or does it need work?

Ready

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