Rename files in distribution archives

(they are meant for different operating systems)

Makefile

@@ -1,13 +1,14 @@
 
-# helper variable
+# helper variables
 MYDIR:=$(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
+.PHONY: help dist dist-zip dist-tar optimize optimize-png
 
 help:
 	@echo "This Makefile is intended to be used by developers only."
 	@echo "Therefore it does nothing by default. Available targets:"
-	@echo "    optimize     :"
+	@echo "    optimize"
 	@echo "            -png : Recompresses png files with zopfli for smaller file size"
-	@echo "    dist         : "
+	@echo "    dist"
 	@echo "        -zip     : Creates a distribution zip archive (for use under Windows)"
 	@echo "        -tar     : Creates a distribution tarball (for other platforms)"
 	@echo "The meta targets will execute all their subtargets."
@@ -16,11 +17,22 @@ dist: dist-tar dist-zip
 
 dist-zip:
 	@rm -f easyrpg-rtp.zip
-	@git archive --prefix=EasyRPG-RTP/ -9 --output=$(MYDIR)/easyrpg-rtp.zip --worktree-attributes master
+	@rm -rf dist-zip
+	@mkdir dist-zip
+	@git archive --prefix=EasyRPG-RTP/ --worktree-attributes master | tar xf - -C dist-zip
+	@cd dist-zip/EasyRPG-RTP; mv README.md README.txt; mv AUTHORS.md AUTHORS.txt; mv COPYING COPYING.txt; \
+		unix2dos -q COPYING.txt README.txt AUTHORS.txt
+	@cd dist-zip; zip -9 -q -r $(MYDIR)/easyrpg-rtp.zip EasyRPG-RTP
+	@rm -rf dist-zip
 
 dist-tar:
 	@rm -f easyrpg-rtp.tar.gz
-	@git archive --prefix=EasyRPG-RTP/ --output=$(MYDIR)/easyrpg-rtp.tar.gz --worktree-attributes master
+	@rm -rf dist-tar
+	@mkdir dist-tar
+	@git archive --prefix=EasyRPG-RTP/ --worktree-attributes master | tar xf - -C dist-tar
+	@cd dist-tar/EasyRPG-RTP; mv README.md README; mv AUTHORS.md AUTHORS
+	@tar czf easyrpg-rtp.tar.gz -C dist-tar EasyRPG-RTP
+	@rm -rf dist-tar
 
 optimize: optimize-png