Make it possible to have a package requiring makeinfo but not install-info.

INFO_FILES is now defined by default to the empty value.
If it is not empty it means that install-info -or a suitable
replacement like pkg_install-info- is required.

USE_MAKEINFO is now defined by default to the 'no' value.
If it has any other value it means that makeinfo is required.
Note that as before simply defining USE_MAKEINFO in a package
Makefile is enough to trigger the use of makeinfo. I.e. it is not
required to be '[yY][eE][sS]'.

As a side effect when using buildlink2 always create install-info and
makeinfo wrappers in ${BUILDLINK_DIR}/bin. This could help
package maintainer to catch spurious/hidden install-info and makeinfo
usage.

Note that for now this nice feature is not really enabled as the relevant
part of bsd.buildlink2.mk is still conditional upon USE_NEW_TEXINFO.
It will really be when USE_NEW_TEXINFO will be removed from pkgsrc.

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