win32/sendmail.c: mark error messages array as const

Author: Girgias

win32/sendmail.c

@@ -63,7 +63,7 @@ char seps[] = " ,\t\n";
 char *php_mailer = "PHP 7 WIN32";
 
 /* Error messages */
-static char *ErrorMessages[] =
+static const char *ErrorMessages[] =
 {
 	"Success", /* 0 */
 	"Bad arguments from form", /* 1 */
@@ -328,7 +328,7 @@ PHPAPI void TSMClose(void)
 // Author/Date:  jcar 20/9/96
 // History:
 //*********************************************************************
-PHPAPI char *GetSMErrorText(int index)
+PHPAPI const char *GetSMErrorText(int index)
 {
 	if (MIN_ERROR_INDEX <= index && index < MAX_ERROR_INDEX) {
 		return (ErrorMessages[index]);

win32/sendmail.h

@@ -36,5 +36,5 @@ PHPAPI int TSendMail(const char *host, int *error, char **error_message,
 			  const char *headers, const char *Subject, const char *mailTo, const char *data,
 			  char *mailCc, char *mailBcc, char *mailRPath);
 PHPAPI void TSMClose(void);
-PHPAPI char *GetSMErrorText(int index);
+PHPAPI const char *GetSMErrorText(int index);
 #endif							/* sendmail_h */