Define which mutexes are blocking and recursive explicitly

src/string.cpp

@@ -1,12 +1,12 @@
-gb_global gbArena     string_buffer_arena = {};
-gb_global gbAllocator string_buffer_allocator = {};
-gb_global gbMutex     string_buffer_mutex = {};
+gb_global gbArena       string_buffer_arena = {};
+gb_global gbAllocator   string_buffer_allocator = {};
+gb_global BlockingMutex string_buffer_mutex = {};
 
 void init_string_buffer_memory(void) {
 	// NOTE(bill): This should be enough memory for file systems
 	gb_arena_init_from_allocator(&string_buffer_arena, heap_allocator(), gb_megabytes(1));
 	string_buffer_allocator = gb_arena_allocator(&string_buffer_arena);
-	gb_mutex_init(&string_buffer_mutex);
+	mutex_init(&string_buffer_mutex);
 }