[PATCH 1/2, newlib] Prefix consistenly target-independent locks with __

[Thomas Preudhomme]

Hi,

With the patch to allow newlib's locking routine to be retargeted currently 
under discussion, we need to start thinking of locks as part of newlib's ABI 
since newlib depends on specific names being provided by the OS. This patch 
renames 2 locks so that they follow the same naming convention as other locks. 
It needs to be applied before the retargeting patch, while locks are still an 
internal consideration.

Newlib builds successfully with this change.

Ok for master branch?

Best regards,

Thomas
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