proc.c: remove unnecessary static function

* proc.c (proc_lambda): remove and use rb_block_lambda directly
  instead.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40525 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
intern.h: rb_block_lambda

* include/ruby/intern.h (rb_block_lambda): add declaration instead of
  deprecated rb_f_lambda.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40526 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-04-30

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40527 b2dd03c8-39d4-4d8f-98ff-823fe69b080e