[ruby-cvs:62481] nobu:r55318 (trunk): ext/date: constify

[nobu at ruby-lang.org]

nobu	2016-06-08 10:09:21 +0900 (Wed, 08 Jun 2016)

  New Revision: 55318

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=55318

  Log:
    ext/date: constify

  Modified files:
    trunk/ext/date/date_core.c
    trunk/ext/date/date_parse.c
    trunk/ext/date/date_tmx.h