Introduce msg_*warn

Also, unify all outputs of "Warning:" and "Error:" to use normal
capitalization instead of mixing it with all capitals.

Corresponding to flashrom svn r1643.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Idwer Vollering <vidwer@gmail.com>
diff --git a/internal.c b/internal.c
index 8dd844d..1c89fd0 100644
--- a/internal.c
+++ b/internal.c
@@ -257,7 +257,7 @@
 #if defined(__i386__) || defined(__x86_64__)
 	if ((cb_parse_table(&cb_vendor, &cb_model) == 0) && (board_vendor != NULL) && (board_model != NULL)) {
 		if (strcasecmp(board_vendor, cb_vendor) || strcasecmp(board_model, cb_model)) {
-			msg_pinfo("WARNING: The mainboard IDs set by -p internal:mainboard (%s:%s) do not\n"
+			msg_pwarn("Warning: The mainboard IDs set by -p internal:mainboard (%s:%s) do not\n"
 				  "         match the current coreboot IDs of the mainboard (%s:%s).\n",
 				  board_vendor, board_model, cb_vendor, cb_model);
 			if (!force_boardmismatch)