bigdecimal.h: suppress warnings

* ext/bigdecimal/bigdecimal.h (VpSetZero, VpSetInf): get rid of
  unused-value warnings by gcc 4.9.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44915 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
error.c: Crash Report log

* error.c (REPORTBUG_MSG): mention about Crash Report log file on
  MacOS X.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e