Make fixes and improvements

- Fix handling of precision in hex float formatting
- Enhance the cocmd interpreter for system() and popen()
- Manually ran the Lua unit tests, which are now passing
- Let stdio i/o operations happen when file is in error state
- We're now saving and restoring xmm in ftrace out of paranoia

third_party/getopt/getopt.internal.h

@@ -18,7 +18,6 @@ extern char *optarg;
 extern int optind, opterr, optopt, optreset;
 
 int getopt(int, char *const[], const char *) paramsnonnull();
-int getsubopt(char **, char *const *, char **) paramsnonnull();
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */

third_party/getopt/getsubopt.c

@@ -29,7 +29,6 @@
 │ SUCH DAMAGE.                                                                 │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/str/str.h"
-#include "third_party/getopt/getopt.internal.h"
 // clang-format off
 
 /*