Utilities: Use grep -E instead of egrep

egrep has been deprecated for a long time. This only appeared in packages with provider_priority or replaces_priority, which presently only affects user/netqmail and user/postfix. It's still good to fix.

Closes: #12 (closed)

abuild.in

@@ -136,12 +136,12 @@ default_sanitycheck() {
 	fi
 
 	if [ -n "$replaces_priority" ] \
-		&& ! echo $replaces_priority | egrep -q '^[0-9]+$'; then
+		&& ! echo $replaces_priority | grep -Eq '^[0-9]+$'; then
 		die "replaces_priority must be a number"
 	fi
 
 	if [ -n "$provider_priority" ] \
-		&& ! echo $provider_priority | egrep -q '^[0-9]+$'; then
+		&& ! echo $provider_priority | grep -Eq '^[0-9]+$'; then
 		die "provider_priority must be a number"
 	fi