Hello,

I propose the following patch (attached) so that one can have the
makeinfo program somehow made pointing at texi2any.

motivation:

- makeinfo (C based) is no longer maintained, so sooner or later we will
  have to allow manual compilation with texi2any
  
- texi2any command line is a superset of makeinfo, so there may be
  installations where calling makeinfo actually calls texi2any (or any
  other tricks like setting MAKEINFO to texi2any before calling
  configure --- e.g., at least on my machine, makeinfo.exe is some
  wrapper that calls texi2any under the hood.

- I think that texi2any versioning commences at 5.0 --- maybe Karl or
  Patrice can confirm, so I think that the test on version number in the
  attached patch would be valid.

If people agree I can do the change.

VBR,
  Vincent.