set gtkmm version to 3.24

needed for Gdk::Cairo::create_surface_from_pixbuf

Fixes #74

Author: ammen99

meson.build

@@ -16,7 +16,7 @@ project(
 wayfire        = dependency('wayfire')
 wayland_client = dependency('wayland-client')
 wayland_protos = dependency('wayland-protocols')
-gtkmm          = dependency('gtkmm-3.0')
+gtkmm          = dependency('gtkmm-3.0', version: '>=3.24')
 wfconfig       = dependency('wf-config', version: '>=0.6.0') #TODO fallback submodule
 gtklayershell  = dependency('gtk-layer-shell-0', version: '>= 0.1', fallback: ['gtk-layer-shell', 'gtk_layer_shell_dep'])
 libpulse       = dependency('libpulse', required : get_option('pulse'))