Avoid compressing files in openlane/

Makefile

diff --git a/Makefile b/Makefile
index 5c3db80..cbc1c31 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # cannot commit files larger than 100 MB to GitHub 
 FILE_SIZE_LIMIT_MB = 100
 LARGE_FILES := $(shell find ./gds -type f -name "*.gds")
-LARGE_FILES += $(shell find . -type f -size +$(FILE_SIZE_LIMIT_MB)M -not -path "./.git/*" -not -path "./gds/*")
+LARGE_FILES += $(shell find . -type f -size +$(FILE_SIZE_LIMIT_MB)M -not -path "./.git/*" -not -path "./gds/*" -not -path "./openlane/*")
 
 LARGE_FILES_GZ := $(addsuffix .gz, $(LARGE_FILES))