git: Ignore builds/ subdirectory
diff --git a/.gitignore b/.gitignore
index 6429423..a698820 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 /xcode/
 /build/
+/builds/
 /build-*/
 .DS_Store
 CMakeCache.txt