fixed += bug with non-char pointers

tcc 0.9.25 can't compile musl (or any libc, probably).
will probably need to write libc for tcc, then compile
gcc or a later version of tcc with it

05/stdc_common.h

@@ -264,6 +264,7 @@ int wait4(int pid, int *status, int options, struct rusage *rusage) {
 #define SIGSEGV 11
 #define SIGTERM 15
 #define SIGBUS 7
+#define SIGTRAP 5
 void abort(void) {
 	kill(getpid(), SIGABRT);
 }