Update gitignore for cmake

Change-Id: Icd50432a60e194c0526a7d28b93e99ceb6f2013b
Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com>
diff --git a/.gitignore b/.gitignore
index 3f8f3c4..a5e4c14 100644
--- a/.gitignore
+++ b/.gitignore
@@ -67,6 +67,8 @@
 .project
 .cproject
 .vscode/
+CMakeLists.txt
+cmake-build*/
 
 # cscope and ctags
 /cscope.*