ruby : handle build options on installation (#3206)

* Don't pass empty string to cmake command

* Refactor Dependencies

* Use found cmake path for options

* Maintain extsources.rb

* List dependent files by directory separator agnostic way

* Prepend whitespace before '='

* Handle build options on install

* Remove useless test

* Retrieve gem file name and version from spec file

* Bump version to 1.3.3

* Update date

* Add install option examples

* [skip ci]Remove unused module

bindings/ruby/ext/extconf.rb

@@ -3,7 +3,7 @@ require_relative "options"
 require_relative "dependencies"
 
 cmake = find_executable("cmake") || abort
-options = Options.new
+options = Options.new(cmake)
 have_library("gomp") rescue nil
 libs = Dependencies.new(cmake, options)