Makefile: Fix crosscompilation installing to wrong directory

[fortysixandtwo]

By using $(CC) instead of hardcoding gcc we make sure to get the
correct triplet that is being used for the installation directory.

Credits go to Helmut Grohne for providing a fix, see
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1003476

[hartwork]

My vote for merging, with this precise plan:

• Merge Cover Linux build by GitHub Actions #37 into dev first
• Rebase Makefile: Fix crosscompilation installing to wrong directory #36 here onto latest dev; that will activate CI for this PR
• Add a change log entry mimicking the usual entry format
• Edit PR Makefile: Fix crosscompilation installing to wrong directory #36 to target dev rather than master (can be done using the edit button on top, no need for a new PR)

@gkdr @fortysixandtwo good?

[fortysixandtwo]

Sounds good to me, just changed the target branch and rebased against dev.

Please ping me, once #37 is in so I can rebase (assuming @gkdr is fine with the proposed plan)

Edit: Also added the suggested changelog entry.

[gkdr]

hi, thank you for the contribution!
i rebase the commit onto dev as a "pr merge", so unless there are conflicts to resolve i'm not sure any further action is even required.

one little request: could you please put your changelog item in the "fixed" section? 🙂

[fortysixandtwo]

one little request: could you please put your changelog item in the "fixed" section? slightly_smiling_face

Oops, changed it just now ;)