nptl: use mmap to allocate initial TLS data for static PIE on noMMU
nptl: use mmap to allocate initial TLS data for static PIE on noMMU

Static PIE ELFs may be loaded on noMMU linux platforms with FDPIC
support, but they don't have adjustable brk, and thus cannot allocate
memory for the TLS. Use mmap instead of sbrk to allocate initial TLS
memory when building with static PIE support for noMMU.

Signed-off-by: Max Filippov <8c5ea195856807f4f02a6e0749c87ea6b7375f38@gmail.com>

kraj/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng