_Mtxinit makes a recursive mutex named SceLibcI_<name> (SceLibcI without
a name) and returns 0, or 1 when the attribute or the mutex cannot be
created. _Mtxlock, _Mtxunlock and _Mtxdst return 1 when the pthread call
fails and 0 otherwise. shadPS4 and fpPS4 agree on both.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
