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/fputs.c

@@ -17,7 +17,6 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/stdio/stdio.h"
-#include "libc/str/str.h"
 
 /**
  * Writes string to stream.
@@ -29,11 +28,12 @@
  * @param s is a NUL-terminated string that's non-NULL
  * @param f is an open stream
  * @return bytes written, or -1 w/ errno
+ * @threadsafe
  */
-int fputs_unlocked(const char *s, FILE *f) {
-  size_t n, r;
-  n = strlen(s);
-  r = fwrite_unlocked(s, 1, n, f);
-  if (!r && n) return -1;
-  return r;
+int fputs(const char *s, FILE *f) {
+  int rc;
+  flockfile(f);
+  rc = fputs_unlocked(s, f);
+  funlockfile(f);
+  return rc;
 }