Remove dollars from system call support symbols

libc/calls/execve-nt.c

@@ -29,7 +29,7 @@
 #include "libc/str/str.h"
 #include "libc/sysv/consts/o.h"
 
-textwindows int execve$nt(const char *program, char *const argv[],
+textwindows int sys_execve_nt(const char *program, char *const argv[],
                           char *const envp[]) {
   int rc;
   size_t i;