While out of scope for this PR, it would be nice to some day get rid of the obscure/redundant acronyms (`GEANY_G(eany)B(uild)O(ption)_FOO`, `GEANY_G(eany)B(uild)G(roup)_FOO`, etc) and use more typical identifiers (`GEANY_BUILD_OPT_FOO`, `GEANY_BUILD_GROUP_FOO`, etc.) which don't require comments to explain what the acronyms stand for.