add pch.mk to .gitignore

diff --git a/.gitignore b/.gitignore
index 97dc476..a6ef0a8 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,4 @@
 /patchysicp-*.tar.gz
 *.pch
 *.gch
+/pch.mk