This fixes#86166 to build cross compilied texinfoInteractive.
BUILD_CC has been renamed to CC_FOR_BUILD so the patch needs to applied
this renaming.
tested on: pkgsCross.armv7l-hf-multiplatform.texinfoInteractive
I hate the thing too even though I made it, and rather just get rid of
it. But we can't do that yet. In the meantime, this brings us more
inline with autoconf and will make it slightly easier for me to write a
pkg-config wrapper, which we need.