Ensure that pages and emails are sent using RFC822-compliant date format

When localization was added to app_voicemail, these headers were altered
when they should have remained in en_US format for RFC compliance. This
reverts the changes to those two lines.

(closes issue ASTERISK-19876)
........

Merged revisions 368520 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 368524 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@368529 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_voicemail.c

@@ -4839,7 +4839,7 @@ static void make_email_file(FILE *p,
 	}
 
 	snprintf(dur, sizeof(dur), "%d:%02d", duration / 60, duration % 60);
-	ast_strftime_locale(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %z", vmu_tm(vmu, &tm), S_OR(vmu->locale, NULL));
+	ast_strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %z", vmu_tm(vmu, &tm));
 	fprintf(p, "Date: %s" ENDL, date);
 
 	/* Set date format for voicemail mail */
@@ -5214,7 +5214,7 @@ static int sendpage(char *srcemail, char *pager, int msgnum, char *context, char
 		snprintf(who, sizeof(who), "%s@%s", srcemail, host);
 	}
 	snprintf(dur, sizeof(dur), "%d:%02d", duration / 60, duration % 60);
-	ast_strftime_locale(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %z", vmu_tm(vmu, &tm), S_OR(vmu->locale, NULL));
+	ast_strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %z", vmu_tm(vmu, &tm));
 	fprintf(p, "Date: %s\n", date);
 
 	/* Reformat for custom pager format */