build: drop md5 and sha256 files from releases

GitHub now shows a sha256 digest for every uploaded release asset, so
the sidecar hash files only clutter the asset list.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

Makefile.am

@@ -49,19 +49,9 @@ distclean-local:
 
 # Target to run when building a release
 release: distcheck
-	@for file in $(DIST_ARCHIVES); do		\
-		md5sum $$file > ../$$file.md5;		\
-		sha256sum $$file > ../$$file.sha256;	\
-	done
 	@mv $(DIST_ARCHIVES) ../
 	@echo
-	@echo "Resulting release files:"
-	@echo "================================================================="
-	@for file in $(DIST_ARCHIVES); do					\
-		printf "$$file    \tDistribution tarball\n";			\
-		printf "$$file.md5\t";    cat ../$$file.md5    | cut -f1 -d' ';	\
-		printf "$$file.sha256\t"; cat ../$$file.sha256 | cut -f1 -d' ';	\
-	done
+	@echo "Resulting release tarball(s): $(DIST_ARCHIVES)"
 
 DISTCHECK_CONFIGURE_FLAGS = --prefix=/usr --sysconfdir=/etc --localstatedir=/var \
 			    --enable-testserv-plugin --enable-x11-common-plugin  \