Fix optind in getopt on musl libc. On exit optind

points to the last non-opt argument of argv, but
in the case where there are only options optind
does not go beyond argc, except on musl libc,
where it becomes argc + 1.

src/jloptions.c

@@ -620,8 +620,9 @@ JL_DLLEXPORT void jl_parse_opts(int *argcp, char ***argvp)
  }
  jl_options.code_coverage = codecov;
  jl_options.malloc_log = malloclog;
- *argvp += optind;
- *argcp -= optind;
+ int proc_args = *argcp < optind ? *argcp : optind;
+ *argvp += proc_args;
+ *argcp -= proc_args;
 }
 
 JL_DLLEXPORT void jl_set_ARGS(int argc, char **argv)