SVN commit 12941 by rakuco: qt5-core: Update QMutex patch to the latest version.
This fix has finally been committed upstream; rename the patch to reflect the fact and use the version that ended up landing in qtbase. A patch-git_680ec54a patch-src_corelib_thread_qmutex_cpp.patch#12940 D patch-src_corelib_thread_qmutex_cpp.patch
