fixup! add support for disabling SSL revocation checks in cURL

When comparing config keys, the key has been downcased already. So we
have to compare it to an all-lowercase string. The buggy code has been
identified by an unnamed colleague of Manuel Riezebosch.

This fixes #1531

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

http.c

@@ -308,7 +308,7 @@ static int http_options(const char *var, const char *value, void *cb)
 		return 0;
 	}
 
-	if (!strcmp("http.schannel.checkRevoke", var)) {
+	if (!strcmp("http.schannel.checkrevoke", var)) {
 		http_schannel_check_revoke = git_config_bool(var, value);
 		return 0;
 	}