Revert "Add sde-linux64 to .gitignore."

This reverts commit fee8559162e8e89af45d2719770eccd76bc920c5.

Oops. Didn't mean to push that one without review.
diff --git a/.gitignore b/.gitignore
index 21e403b..41c6e96 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,7 +18,5 @@
 util/bot/llvm-build
 util/bot/perl-win32
 util/bot/perl-win32.zip
-util/bot/sde-linux64
-util/bot/sde-linux64.tar.bz2
 util/bot/win_toolchain.json
 util/bot/yasm-win32.exe