patch 8.2.4246: one error message not in errors.h

Problem:    One error message not in errors.h. (Antonio Colombo)
Solution:   Move the message and rename.

src/errors.h

@@ -747,7 +747,10 @@ EXTERN char e_didnt_get_block_nr_one[]
 	INIT(= N_("E298: Didn't get block nr 1?"));
 EXTERN char e_didnt_get_block_nr_two[]
 	INIT(= N_("E298: Didn't get block nr 2?"));
-// E299 unused
+#ifdef FEAT_PERL
+EXTERN char e_perl_evaluation_forbidden_in_sandbox_without_safe_module[]
+	INIT(= N_("E299: Perl evaluation forbidden in sandbox without the Safe module"));
+#endif
 EXTERN char e_swap_file_already_exists_symlink_attack[]
 	INIT(= N_("E300: Swap file already exists (symlink attack?)"));
 EXTERN char e_oops_lost_the_swap_file[]

src/if_perl.xs

@@ -1030,7 +1030,6 @@ VIM_init(void)
 #ifdef DYNAMIC_PERL
 static char *e_noperl = N_("Sorry, this command is disabled: the Perl library could not be loaded.");
 #endif
-static char *e_perlsandbox = N_("E299: Perl evaluation forbidden in sandbox without the Safe module");
 
 /*
  * ":perl"
@@ -1084,7 +1083,7 @@ ex_perl(exarg_T *eap)
 	safe = perl_get_sv("VIM::safe", FALSE);
 # ifndef MAKE_TEST  /* avoid a warning for unreachable code */
 	if (safe == NULL || !SvTRUE(safe))
-	    emsg(_(e_perlsandbox));
+	    emsg(_(e_perl_evaluation_forbidden_in_sandbox_without_safe_module));
 	else
 # endif
 	{
@@ -1361,7 +1360,7 @@ do_perleval(char_u *str, typval_T *rettv)
 	    safe = get_sv("VIM::safe", FALSE);
 # ifndef MAKE_TEST  /* avoid a warning for unreachable code */
 	    if (safe == NULL || !SvTRUE(safe))
-		emsg(_(e_perlsandbox));
+		emsg(_(e_perl_evaluation_forbidden_in_sandbox_without_safe_module));
 	    else
 # endif
 	    {

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4246,
 /**/
     4245,
 /**/