Graduate some clock_gettime() constants to #define

- CLOCK_THREAD_CPUTIME_ID
- CLOCK_PROCESS_CPUTIME_ID

Cosmo now supports the above constants universally across supported OSes
therefore it's now safe to let programs detect their presence w/ #ifdefs

ape/specification.md

@@ -402,8 +402,8 @@ arises in the fact that our Linux-flavored GCC and Clang toolchains
 producing TLS instructions that use the %fs convention.
 
 To solve these challenges, the `cosmocc` compiler will rewrite binary
-objects after they've been compiled by GCC, so that `%gs` register is
-used, rather than `%fs`. Morphing x86-64 binaries after they've been
+objects after they've been compiled by GCC, so that the `%gs` register
+is used, rather than `%fs`. Morphing x86-64 binaries after they've been
 compiled is normally difficult, due to the complexity of the machine
 instruction language. However GCC provides `-mno-tls-direct-seg-refs`
 which greatly reduces the complexity of this task. This flag forgoes

libc/runtime/weakfree.c

@@ -24,7 +24,6 @@
  * Thunks free() if it's linked, otherwise do nothing.
  */
 void _weakfree(void *p) {
-  if (_weaken(free)) {
+  if (_weaken(free))
     _weaken(free)(p);
-  }
 }

libc/sysv/consts/clock.h

@@ -24,7 +24,9 @@ extern const int CLOCK_UPTIME_PRECISE;
 
 COSMOPOLITAN_C_END_
 
-#define CLOCK_REALTIME  0
-#define CLOCK_MONOTONIC CLOCK_MONOTONIC
+#define CLOCK_REALTIME           0
+#define CLOCK_MONOTONIC          CLOCK_MONOTONIC
+#define CLOCK_PROCESS_CPUTIME_ID CLOCK_PROCESS_CPUTIME_ID
+#define CLOCK_THREAD_CPUTIME_ID  CLOCK_THREAD_CPUTIME_ID
 
 #endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_CLOCK_H_ */

libc/thread/pthread_create.c

@@ -118,7 +118,7 @@ void _pthread_decimate(bool annihilation_only) {
     if (status != kPosixThreadZombie)
       break;  // zombies only exist at the end of the linked list
     if (atomic_load_explicit(&pt->tib->tib_tid, memory_order_acquire))
-      continue;  // undead thread should that'll stop existing soon
+      continue;  // undead thread that should stop existing soon
     dll_remove(&_pthread_list, e);
     dll_make_first(&list, e);
   }