RFE: Fix license permissions

[nim-nim]

Some upstreams are very new to git and are committing license file with executable permissions (probably from windows or OSX)

rpmlint rightly points out something is suspicious

Since I can’t imagine a case where we would want to package an executable license file, please attr license files by default to 0644, so packagers do not need to sprinkle their %preps with manual chmods

[Conan-Kudo]

This could be done as a buildroot policy (brp) script, couldn't it?

[pmatilai]

So... a general purpose brp-setperms [options] <path> [...] script, anyone? 😇
That could then be used for adding brp-macros for tweaking license and doc (#567) permissions, plus who knows what else.

[ffesti]

What about an permissions macro in fileattr files to set the permission for a give file type?

[pmatilai]

Should be done as a part of #567.

[pmatilai]

This should be done together with #567.

[pmatilai]

Actually, makes more sense to just merge this into #567.