Make find_account_by_envelope_from case insensitive

Problem: My email going to the default mail server instead of the one for
bphilips AT suse.de.  This was my MUA was writing the from address as
BPhilips AT suse.de since I was replying to an email addressed in that casing.

Signed-off-by: Brandon Philips <bphilips@suse.de>
---
 src/conf.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: msmtp/src/conf.c
===================================================================
--- msmtp.orig/src/conf.c
+++ msmtp/src/conf.c
@@ -206,7 +206,7 @@ account_t *find_account_by_envelope_from
     {
 	acc_list = acc_list->next;
 	acc_from = ((account_t *)(acc_list->data))->from;
-	if (acc_from && strcmp(from, acc_from) == 0)
+	if (acc_from && strcasecmp(from, acc_from) == 0)
 	{
 	    a = acc_list->data;
 	    break;
