[RFA] Use VPATH to find info files for installation.

[Jimmy Guo]

>+	for j in $?; do \
>+		for i in $$i*; do \
		         ^^^^
$$j*?

>+			$(INSTALL_DATA) $$i $(infodir)/$$i ; \
>+		done; \
>+	done

- Jimmy Guo, guo@cup.hp.com