Apply even more fixups

- Finish cleaning up the stdio unlocked APIs
- Make __cxa_finalize() properly thread safe
- Don't log locks if threads aren't being used
- Add some more mutex guards to places using _mmi
- Specific lock names now appear in the --ftrace logs
- Fix mkdeps.com generating invalid Makefiles sometimes
- Simplify and fix bugs in the test runner infrastructure
- Fix issue where sometimes some functions wouldn't be logged

libc/stdio/getc.c

@@ -21,7 +21,8 @@
 /**
  * Reads byte from stream.
  * @return byte in range 0..255, or -1 w/ errno
+ * @threadsafe
  */
-int(getc_unlocked)(FILE *f) {
-  return fgetc_unlocked(f);
+int(getc)(FILE *f) {
+  return getc(f);
 }