patch 8.0.1788: tool to check a color scheme is not installed

Problem:    Tool to check a color scheme is not installed.
Solution:   Update the install rule. (Christian Brabandt)
diff --git a/src/Makefile b/src/Makefile
index 85de383..d7b8f7e 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2473,8 +2473,9 @@
 	cd $(PRINTSOURCE); $(INSTALL_DATA) *.ps $(DEST_PRINT)
 	cd $(DEST_PRINT); chmod $(FILEMOD) *.ps
 # install the colorscheme files
-	cd $(COLSOURCE); $(INSTALL_DATA) *.vim README.txt $(DEST_COL)
-	cd $(DEST_COL); chmod $(HELPMOD) *.vim README.txt
+	cd $(COLSOURCE); $(INSTALL_DATA_R) *.vim tools README.txt $(DEST_COL)
+	cd $(DEST_COL); chmod $(DIRMOD) tools
+	cd $(DEST_COL); chmod $(HELPMOD) *.vim README.txt tools/*.vim
 # install the syntax files
 	cd $(SYNSOURCE); $(INSTALL_DATA) *.vim README.txt $(DEST_SYN)
 	cd $(DEST_SYN); chmod $(HELPMOD) *.vim README.txt