* lib/mkmf.rb:  Documented MakeMakefile constants.  Hid implementation
	  details from RDoc 


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38933 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_process.rb: reduce command string size

* test/ruby/test_process.rb (test_spawn_too_long_path),
  (test_aspawn_too_long_path): reduce command string size until
  intended exception occurs.  [ruby-core:51592] [Bug #7721]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38934 b2dd03c8-39d4-4d8f-98ff-823fe69b080e