Log Message:
Update ruby-gnome2 to 0.15.  Patch provided by Dieter Roelants in PR 34064.

Changes:

Ruby/GLib
* Improve signal handlers with pthread ruby(--enable-pthread). [Sjoerd Simons]
* Added new fundamental object for other bindings. [Sjoerd Simons]
* GLib::Source#remove? -> GLib::Soruce.remove? [Kouhei Sutou]
* Added new macros (GLIST2ARYF, GLIST2ARY2F, GSLIST2ARYF, GLIST2ARY2F, \ 
G_PROTECT_CALLBACK) [Masao Mutoh]
* Added GLib.win32_locale, GLib, win32_locale_filename_from_utf8 [Kouhei Sutou]
* Improve memory management [Kouhei Sutou, Sjoerd Simons, Masahiro Sakai, Masao \ 
Mutoh]
* Other improvement and fix bugs. [Sjoerd Simons, Joao Pedrosa, Kouhei Sutou, \ 
Masahiro Sakai, Masao Mutoh]

Ruby/ATK
* Improved cygwin support. [Masao Mutoh]
* Fix a bug. [Masahiro Sakai]

Ruby/Pango
* Fix some bugs. [Laurent Sansonetti, Masao Mutoh]
* Added Pango::Layout#markup=, Pango::AttrAbsoluteSize? [Masao Mutoh]

Ruby/GdkPixbuf
* Fix a bug. [NISHI Takao]
* Code cleanup [Masao Mutoh]

Ruby/GTK
* Improve signal handlers. [Masahiro Sakai]
* Added Gtk::Widget#set_widget, #set_requisition. [Daniel Chokola]
* Added Gtk::Dialog#get_response. [Masao Mutoh]
* Other improvement and fix bugs [Mario Steele, Tilman Sauerbeck, Geoff Youngs, \ 
Masahiro Sakai, Kouhei Sutou, Masao Mutoh]

Ruby/GNOME
* Follow Ruby/GLib2 change(GRClosure). [Kouhei Sutou]

Ruby/GnomeCanvas
* Code cleanup [Kouhei Sutou, Masao Mutoh]

Ruby/Libart
* None.

Ruby/PanelApplet
* Fixed a bug [Patch #1431855]