include/sys/mman.h: remove madvise/posix_madvise prototypes on noMMU
include/sys/mman.h: remove madvise/posix_madvise prototypes on noMMU

Signed-off-by: Thomas Petazzoni <a5d87d2bd7c424ee5cbdb4e978635bf653d5a005@free-electrons.com>

kraj/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng,brgl/uclibc-ng,kraj/uclibc-ng,brgl/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng,brgl/uclibc-ng,brgl/uclibc-ng