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/Makefile b/Makefile
index 5f93646..e17d821 100644
--- a/Makefile
+++ b/Makefile
@@ -416,6 +416,10 @@
 $(VERSION_FILE):
 		@( printf '#define U_BOOT_VERSION "U-Boot %s%s"\n' "$(U_BOOT_VERSION)" \
 		 '$(shell $(TOPDIR)/tools/setlocalversion $(TOPDIR))' ) > $@.tmp
+		@( printf '#define CC_VERSION_STRING "%s"\n' \
+		 '$(shell $(CC) --version | head -n 1)' )>>  $@.tmp
+		@( printf '#define LD_VERSION_STRING "%s"\n' \
+		 '$(shell $(LD) -v | head -n 1)' )>>  $@.tmp
 		@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
 
 $(TIMESTAMP_FILE):