libtcc: filetype cleanup

- does not change signature of tcc_add_file

tcc.c

@@ -311,14 +311,16 @@ int main(int argc, char **argv)
     /* compile or add each files or library */
     for(i = ret = 0; i < s->nb_files && ret == 0; i++) {
         struct filespec *f = s->files[i];
-        if (f->type == 'l') {
+        if (f->type == AFF_TYPE_LIB) {
             if (tcc_add_library_err(s, f->name) < 0)
                 ret = 1;
         } else {
             if (1 == s->verbose)
                 printf("-> %s\n", f->name);
-            if (tcc_add_file(s, f->name, f->type) < 0)
+            s->filetype = f->type;
+            if (tcc_add_file(s, f->name) < 0)
                 ret = 1;
+            s->filetype = AFF_TYPE_NONE;
             if (!first_file)
                 first_file = f->name;
         }