MLECO-1910: Fix for CPU counter difference

Fixed the CPU counter being truncated by the diff function's return type.

Change-Id: I9417dbc9da357f8593b67c3a94620ac6e62eddbf
diff --git a/.gitignore b/.gitignore
index 2a80d95..70914be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,8 +10,8 @@
 
 # Build files
 CMakeFiles
-build
-cmake-build-*
+build*/
+cmake-build-*/
 
 # Virtual environments
 scripts/py/env*