also control the list of man pages installed, so that they correspond better to the binaries.

This is the second version of this fix, including review comments.


configure.in:
  Several of our man pages are specific to parts (table handlers, features, ...)
  which are controlled by "configure" options, so there are builds which do not
  include these parts.
  For such builds, remove those specific man pages from the list of man pages
  to be installed, so that the man pages correspond better to the binaries.
  
  In this patch, do it for NDB (modify Kent's approach), "embedded", and InnoDB.
  
  Ensure that the handling of the man pages is determined only after the options
  have been processed, the old nandling (NDB only) was done too early.
  
  This is the second version of this fix, including review comments.