[GnuToolchain] Update extra env flags (Android + `CC|CXX_FOR_BUILD`)#16596

Merged

memsharded merged 2 commits intoconan-io:develop2from franramirez688:frm/gnutoolchain_update

Jul 31, 2024

+153-29

Commits on Jul 3, 2024

Added XXXX_FOR_BUILD variables and android extra flags mechanism
franramirez688
committed

Commits on Jul 31, 2024

Merge branch 'develop2' into frm/gnutoolchain_update
memsharded
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