Thread-naming fix for linux.

modules/juce_core/native/juce_posix_SharedCode.h

@@ -880,7 +880,7 @@ void Thread::setCurrentThreadName (const String& name)
         [[NSThread currentThread] setName: juceStringToNS (name)];
     }
    #elif JUCE_LINUX
-    prctl (PR_SET_NAME, name.toRawUTF8(), 0, 0, 0);
+    pthread_setname_np (pthread_self(), name.toRawUTF8());
    #endif
 }