[libpng16] Remove pnglibconf.h, pnglibconf.c, and pnglibconf.out instead of

pnglibconf.* in "make clean" (Cosmin).
diff --git a/scripts/makefile.std b/scripts/makefile.std
index 75bb2de..ee6a868 100644
--- a/scripts/makefile.std
+++ b/scripts/makefile.std
@@ -106,7 +106,8 @@
 	chmod 644 $(DESTDIR)$(LIBPATH)/libpng.a
 
 clean:
-	$(RM_F) *.o libpng.a pngtest pngout.png pnglibconf.*
+	$(RM_F) *.o libpng.a pngtest pngout.png pnglibconf.h pnglibconf.c \
+	pnglibconf.out
 
 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
diff --git a/scripts/pnglibconf.mak b/scripts/pnglibconf.mak
index c7117dd..883f932 100755
--- a/scripts/pnglibconf.mak
+++ b/scripts/pnglibconf.mak
@@ -49,6 +49,6 @@
 	$(MOVE) pnglibconf.tmp $@
 
 clean-pnglibconf:
-	$(DELETE) pnglibconf.*
+	$(DELETE) pnglibconf.h pnglibconf.c pnglibconf.out
 
 clean: clean-pnglibconf