Fix clean rules to be more precise, avoiding warnings from "del"

when running them after a full build.

ChangeLog

@@ -1,5 +1,8 @@
 2008-01-01  Frank Warmerdam  <warmerdam@pobox.com>
 
+	* Makefile.vc, libtiff/Makefile.vc, tools/Makefile.vc: Improve clean
+	targets.
+
 	* tools/tiffinfo.c, tools/tiffcmp.c, tools/gif2tiff.c, tools/bmp2tiff.c
 	tools/tiff2pdf.c: Fix 64-bit warnings when compiling under MSVC 2005 
 	(x64). 

Makefile.vc

@@ -1,4 +1,4 @@
-# $Id: Makefile.vc,v 1.6 2006-10-13 10:30:21 dron Exp $
+# $Id: Makefile.vc,v 1.7 2008-01-01 15:53:10 fwarmerdam Exp $
 #
 # Copyright (C) 2004, Andrey Kiselev <dron@ak4719.spb.edu>
 #
@@ -47,7 +47,6 @@ tools:	lib
 	cd ..
 
 clean:
-	-del *.exe.manifest
 	cd port
 	$(MAKE) /f Makefile.vc clean
 	cd..
@@ -57,9 +56,3 @@ clean:
 	cd tools
 	$(MAKE) /f Makefile.vc clean
 	cd ..
-
-	-del *.ilk
-	-del *.dll.manifest
-	-del *.exe.manifest
-	-del *.exp
-	-del *.pdb

libtiff/Makefile.vc

@@ -1,4 +1,4 @@
-# $Id: Makefile.vc,v 1.20 2007-07-18 14:18:08 dron Exp $
+# $Id: Makefile.vc,v 1.21 2008-01-01 15:53:10 fwarmerdam Exp $
 #
 # Copyright (C) 2004, Andrey Kiselev <dron@ak4719.spb.edu>
 #
@@ -97,5 +97,5 @@ clean:
 	-del *.obj
 	-del *.lib
 	-del *.dll
-	-del *.exe
+	-del *.dll.manifest
 	-del *.pdb

tools/Makefile.vc

@@ -1,4 +1,4 @@
-# $Id: Makefile.vc,v 1.13 2007-02-24 15:26:09 dron Exp $
+# $Id: Makefile.vc,v 1.14 2008-01-01 15:53:10 fwarmerdam Exp $
 #
 # Copyright (C) 2004, Andrey Kiselev <dron@ak4719.spb.edu>
 #
@@ -48,4 +48,5 @@ tiffgt.exe:
 
 clean:
 	-del *.exe
+	-del *.exe.manifest
 	-del *.obj