patch 8.2.1148: warning for using int instead of size_t

Problem:    Warning for using int instead of size_t.
Solution:   Change "len" argument to size_t. (Mike Williams)

src/proto/vim9compile.pro

@@ -1,5 +1,5 @@
 /* vim9compile.c */
-int check_defined(char_u *p, int len, cctx_T *cctx);
+int check_defined(char_u *p, size_t len, cctx_T *cctx);
 type_T *typval2type(typval_T *tv);
 int check_type(type_T *expected, type_T *actual, int give_msg);
 char_u *skip_type(char_u *start);

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1148,
 /**/
     1147,
 /**/

src/vim9compile.c

@@ -288,7 +288,7 @@ lookup_script(char_u *name, size_t len)
  * Return FAIL and give an error if it defined.
  */
     int
-check_defined(char_u *p, int len, cctx_T *cctx)
+check_defined(char_u *p, size_t len, cctx_T *cctx)
 {
     if (lookup_script(p, len) == OK
 	    || (cctx != NULL

src/vim9script.c

@@ -324,7 +324,7 @@ handle_import(
 	    if (eval_isnamec1(*arg))
 		while (eval_isnamec(*arg))
 		    ++arg;
-	    if (check_defined(p, (int)(arg - p), cctx) == FAIL)
+	    if (check_defined(p, arg - p, cctx) == FAIL)
 		goto erret;
 	    as_name = vim_strnsave(p, arg - p);
 	    arg = skipwhite_and_linebreak(arg, evalarg);