nbis: fix build on musl
Drop re-definition of stderr. There's no need for this anywhere (including glibc). This breaks in particular on musl because stderr (and stdin) are both const, and macros unlike in glibc.
Drop re-definition of stderr. There's no need for this anywhere (including glibc). This breaks in particular on musl because stderr (and stdin) are both const, and macros unlike in glibc.