This file was copied over to allow for the compilation of some
of the arch/i386 code, due to a bug in lib/libc/compat/Makefile.inc.
This patch fixes the situation, and removes the now useless header, as
well as remove a patch in lib/libc/stdlib/putenv.c
Change-Id: Ic5e4c4bb967f58f6e874c091788e1dd5ecaebe5e