Use standard install dirs

[hamarituc]

Some Linux distributions decided to install libraries into /usr/lib64 instead of /usr/lib. Thus, the GNUInstallDirs module should be used.

[DavidEGrayson]

Did you actually have a problem on some distribution? What distribution is it, and did it prevent you from running the software and/or linking against it?

[hamarituc]

Did you actually have a problem on some distribution? What distribution is it, and did it prevent you from running the software and/or linking against it?

I am packaging it for Gentoo Linux in my personal package repository (https://github.com/hamarituc/gentoo-overlay/) as a dependency for INDI (https://indilib.org/).

Without the patch it raises a warning during the install phase

Files matching a file type that is not allowed:
   usr/lib/libpololu-tic-1.so.1.8.3
 * ERROR: app-misc/pololu-tic-software-1.8.3::hamari-dev failed:
 *   multilib-strict check failed!

On multilib systems it is crucial to install libraries for different ABIs into separate directories.