c11/threads: resolve link issues with -O0

Add weak symbol notation for the pthread_mutexattr* symbols, thus making
the linker happy. When building with -O1 or greater the optimiser will
kick in and remove the said functions as they are dead/unreachable code.

Ideally we'll enable the optimisations locally, yet that does not seem
to work atm.

v2: Add the AX_GCC_FUNC_ATTRIBUTE([weak]) hunk in configure.

Cc: Alejandro Piñeiro <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: Ilia Mirkin <[email protected]>
Cc: Rob Herring <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>
Tested-by: Rob Clark <[email protected]>
Tested-by: Mark Janes <[email protected]>

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