gitignore: Have multiple crossgcc versions

Make it so that git does not remove old copies or the symlink.

Change-Id: I27be60c897d2f86cdf274480c83cbbfe38fcdf94
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/10292
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/.gitignore b/.gitignore
index 0398b15..f7447b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,6 +30,8 @@
 util/crossgcc/tarballs/
 util/crossgcc/w32api-*/
 util/crossgcc/xgcc/
+util/crossgcc/xgcc-*/
+util/crossgcc/xgcc
 site-local
 
 *.\#