* grab patches from gentoo to fix various 2-stage cross build system
bugs
* explicitly set CrossCompilePrefix to the expected targetPrefix
-- ensures everything has expected name and location
-- fixes lack of prefix'ing when doing glibc -> musl "cross"
* Stage1Only: only set if doing "true" cross
* don't try to specify include/lib dirs for ncurses on cross
-- only used by terminfo which actually removed the include option,
and the lib option doesn't seem to do anything other than
confuse the situation re:cross.
Fixes#37522
6cc5483b5e