signal.c: adjust indent

* signal.c (ruby_atomic_compare_and_swap): adjust indent.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43431 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
envutil.rb: disable gems in child process

* test/ruby/envutil.rb (assert_separately): disable gems by default to
  get rid of loading test-unit gem, which doesn't have _assertions
  method.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43432 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
range.c: modify check

* range.c (range_initialize_copy): disallow to modify after
  initialized.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43433 b2dd03c8-39d4-4d8f-98ff-823fe69b080e