fix: Clean build artifacts for successful repackage

The clean target in the Makefile wasn't removing all the temporary
build files and directories, specifically build and jsonnet.egg-info.
This caused a problem when trying to repackage the source for Debian.
For more details about the problem, see the following bug report:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1047367

This patch simply adds these to the clean command, ensuring a truly
clean build environment, which is required by Debian policy.
This change isn't just for Debian; it will also benefit other
distributions that package Jsonnet, as it ensures a consistent
and reliable build process across all platforms.

Author: daichifukui

Makefile

@@ -224,7 +224,7 @@ $(RELEASE_FILE): bins
 dist: $(RELEASE_FILE)
 
 clean:
-	rm -vf */*~ *~ .*~ */.*.swp .*.swp $(ALL) *.o core/*.jsonnet.h Makefile.depend *.so.* $(RELEASE_FILE)
+	rm -rvf */*~ *~ .*~ */.*.swp .*.swp $(ALL) *.o core/*.jsonnet.h Makefile.depend *.so.* build jsonnet.egg-info $(RELEASE_FILE)
 
 -include Makefile.depend