* include/ruby/defines.h (BDIGIT): Define it only if it is not defined
  yet.  This eases tests and debug.
  (SIZEOF_BDIGITS): Ditto.
  (BDIGIT_DBL): Ditto.
  (BDIGIT_DBL_SIGNED): Ditto.
  (PRI_BDIGIT_PREFIX): Ditto.
  (PRI_BDIGIT_DBL_PREFIX): Ditto.
  (PRIdBDIGIT): Define it only if PRI_BDIGIT_PREFIX is defined.
  (PRIiBDIGIT): Ditto.
  (PRIoBDIGIT): Ditto.
  (PRIuBDIGIT): Ditto.
  (PRIxBDIGIT): Ditto.
  (PRIXBDIGIT): Ditto.
  (PRIdBDIGIT_DBL): Ditto.
  (PRIiBDIGIT_DBL): Ditto.
  (PRIoBDIGIT_DBL): Ditto.
  (PRIuBDIGIT_DBL): Ditto.
  (PRIxBDIGIT_DBL): Ditto.
  (PRIXBDIGIT_DBL): Ditto.

* include/ruby/ruby.h (RBIGNUM_EMBED_LEN_MAX): Define it only if it is
  not defined yet.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41587 b2dd03c8-39d4-4d8f-98ff-823fe69b080e