patch 8.2.3231: build failure with small features

Problem:    Build failure with small features.
Solution:   Adjust #ifdef.

src/errors.h

@@ -224,8 +224,10 @@ EXTERN char e_using_number_as_string[]
 	INIT(= N_("E1024: Using a Number as a String"));
 EXTERN char e_using_rcurly_outside_if_block_scope[]
 	INIT(= N_("E1025: Using } outside of a block scope"));
+#endif
 EXTERN char e_missing_rcurly[]
 	INIT(= N_("E1026: Missing }"));
+#ifdef FEAT_EVAL
 EXTERN char e_missing_return_statement[]
 	INIT(= N_("E1027: Missing return statement"));
 EXTERN char e_compiling_def_function_failed[]

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3231,
 /**/
     3230,
 /**/