merge revision(s) 36432: [Backport #6734]

	* configure.in (EXTDLDFLAGS): split options for each extension
	  libraries, and unused in ruby.pc.  [Bug #6734]

	* lib/mkmf.rb (MakeMakefile#configuration): add EXTDLDFLAGS.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@40053 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 39967: [Backport #8194]

	* time.c (num_exact): use to_r method only if to_int method is
	  available.
	  [ruby-core:53764] [Bug #8173] reported by Hiro Asari.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@40054 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 40015: [Backport #8196]

	doumentation by @toolmantim [GH fixes #270]

 * timeout.rb: Document Timeout::timeout 0 and nil argument behavior



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@40055 b2dd03c8-39d4-4d8f-98ff-823fe69b080e