remove inc bc its too unstable

jk.c

@@ -7284,7 +7284,6 @@ void jkexec(interpreter_t *state, FILE *fd, bool isrepl, char **s) {
 
 int main(int argc, char **argv) {
   GC_INIT();
-  GC_enable_incremental();
 
   guards = list_new();