[hackers] [scroll] Add distclean make target || Quentin Rameau

[git]

commit 3578d0da42c9a39af72c295a0b531c2808a86e59
Author:     Quentin Rameau <quinq@fifth.space>
AuthorDate: Sat Apr 11 14:30:11 2020 +0200
Commit:     Jochen Sprickerhof <g...@jochen.sprickerhof.de>
CommitDate: Sat Apr 11 18:24:37 2020 +0200

    Add distclean make target

diff --git a/Makefile b/Makefile
index c3e1c50..4d415b7 100644
--- a/Makefile
+++ b/Makefile
@@ -4,9 +4,6 @@ include config.mk
 
 all: scroll
 
-clean:
-       rm -f scroll ptty
-
 config.h:
        cp config.def.h config.h
 
@@ -24,7 +21,13 @@ test: scroll ptty
        if ! ./ptty ./scroll true;  then exit 1; fi
        if   ./ptty ./scroll false; then exit 1; fi
 
+clean:
+       rm -f scroll ptty
+
+distclean: clean
+       rm -f config.h
+
 .c:
        $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $< -lutil
 
-.PHONY: all clean install test
+.PHONY: all install test clean distclean