fbset: support setting pixel clock rate

Only in case the FEATURE_FBSET_FANCY configuration is enabled.

function                                             old     new   delta
fbset_main                                           733     766     +33

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/fbset.c b/util-linux/fbset.c
index 0eaa7c0..768ab80 100644
--- a/util-linux/fbset.c
+++ b/util-linux/fbset.c
@@ -518,6 +518,9 @@
 			case CMD_DEPTH:
 				var_set.bits_per_pixel = xatou32(argv[1]);
 				break;
+			case CMD_PIXCLOCK:
+				var_set.pixclock = xatou32(argv[1]);
+				break;
 #endif
 			default:
 				bb_perror_msg_and_die("option '%s' not handled",