Draft: util: Add c11_prefix for c11 threads API
What does this MR do and why?
cc @dh
For resolve issue from !29054 (closed)
util: Add c11_prefix for c11 threads API
As for not conflicting with system libc that already have c11 threads API, add c11 prefix for mesa implemented
C11 threads
Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>