Remove a needless use of bash

sh can do this just as well, so don't require bash needlessly.

Author: PatZim

tools/build/Makefile-Moar.in

@@ -73,7 +73,7 @@ manifest:
 
 release: manifest
 	[ -n "$(VERSION)" ] || ( echo "\nTry 'make release VERSION=yyyy.mm'\n\n"; exit 1 )
-	bash -c '[ "$$(cat VERSION)" == "$(VERSION)" ] || ( echo -e "\nVersion on command line and in VERSION file differ\n"; exit 1 )'
+	sh -c '[ "$$(cat VERSION)" == "$(VERSION)" ] || ( echo -e "\nVersion on command line and in VERSION file differ\n"; exit 1 )'
 	[ -d nqp-$(VERSION) ] || ln -s . nqp-$(VERSION)
 	$(PERL) -ne 'print "nqp-$(VERSION)/$$_"' MANIFEST |\
 	    tar -zcv --owner=0 --group=0 --numeric-owner -T - -f nqp-$(VERSION).tar.gz