[gnumeric] win32: fix cleaning.

[Morten Welinder <mortenw src gnome org>]

commit a2ea68d17f4efbee3ae9165d6ab89f7ec395f01c
Author: Morten Welinder <terra gnome org>
Date:   Fri Jul 30 20:51:36 2010 -0400

    win32: fix cleaning.

 tools/win32/Makefile.am |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/tools/win32/Makefile.am b/tools/win32/Makefile.am
index 5bb090e..0c864aa 100755
--- a/tools/win32/Makefile.am
+++ b/tools/win32/Makefile.am
@@ -8,8 +8,7 @@ debug:: all
 release:: all
 	$(abs_srcdir)/build $(abs_builddir) $(abs_srcdir) release
 
-distclean:
-	rm -rf debug release
+DISTCLEANFILES = debug release
 
 EXTRA_DIST = gnumeric.nsi.in gtkrc moduleset.in \
 	build jhbuildrc.py