added scm-clean target

Makefile.am

@@ -39,3 +39,32 @@ endif
 EXTRA_DIST = udev doxygen
 
 dist_doc_DATA = README.txt AUTHORS.txt LICENSE-bsd.txt LICENSE-gpl3.txt LICENSE-orig.txt LICENSE.txt
+
+SCMCLEAN_TARGETS= \
+ aclocal.m4 \
+ config.guess \
+ config.sub \
+ configure \
+ config.h.in \
+ depcomp \
+ install-sh \
+ ltmain.sh \
+ missing \
+ mac/Makefile.in \
+ testgui/Makefile.in \
+ libusb/Makefile.in \
+ Makefile.in \
+ linux/Makefile.in \
+ windows/Makefile.in \
+ m4/libtool.m4 \
+ m4/lt~obsolete.m4 \
+ m4/ltoptions.m4 \
+ m4/ltsugar.m4 \
+ m4/ltversion.m4
+
+SCMCLEAN_DIR_TARGETS = \
+ autom4te.cache
+
+scm-clean: distclean
+	rm -f $(SCMCLEAN_TARGETS)
+	rm -Rf $(SCMCLEAN_DIR_TARGETS)