Print compiler and linker version with the version command

After years of unsuccessful research I've finally shamelessly stolen other
peoples intellectual properties to present the all-new and world-changing
updated version command:
-
U-Boot>> version

U-Boot 2010.12-00014-g7435056-dirty (Jan 18 2011 - 23:19:38)
MyBoard
gcc (GCC) 0.42 (Distro foobar)
GNU ld (GNU Binutils) 0.314159265
-
May the toolchain bugs rest in peace.

Signed-off-by: Alexander Holler <holler@ahsoftware.de>
diff --git a/common/cmd_version.c b/common/cmd_version.c
index 7d1b495..83cb11c 100644
--- a/common/cmd_version.c
+++ b/common/cmd_version.c
@@ -23,18 +23,25 @@
 
 #include <common.h>
 #include <command.h>
+#include <version.h>
 
 extern char version_string[];
 
 int do_version(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	printf("\n%s\n", version_string);
+#ifdef CC_VERSION_STRING
+	puts(CC_VERSION_STRING "\n");
+#endif
+#ifdef LD_VERSION_STRING
+	puts(LD_VERSION_STRING "\n");
+#endif
 
 	return 0;
 }
 
 U_BOOT_CMD(
 	version,	1,		1,	do_version,
-	"print monitor version",
+	"print monitor, compiler and linker version",
 	""
 );