Make improvements

- Add GetCpuCount() API to redbean
- Add unix.gmtime() API to redbean
- Add unix.readlink() API to redbean
- Add unix.localtime() API to redbean
- Perfect the new redbean UNIX module APIs
- Integrate with Linux clock_gettime() vDSO
- Run Lua garbage collector when malloc() fails
- Fix another regression quirk with linenoise repl
- Fix GetProgramExecutableName() for systemwide installs
- Fix a build flake with test/libc/mem/test.mk SRCS list

test/libc/calls/dup_test.c

@@ -51,8 +51,8 @@ TEST(dup, clearsCloexecFlag) {
   ASSERT_NE(-1, (ws = xspawn(0)));
   if (ws == -2) {
     dup2(3, 0);
-    execv(program_executable_name,
-          (char *const[]){program_executable_name, "boop", 0});
+    execv(GetProgramExecutableName(),
+          (char *const[]){GetProgramExecutableName(), "boop", 0});
     _exit(127);
   }
   ASSERT_EQ(72, WEXITSTATUS(ws));