project: Rename build options

Following the new meson porting guidelines, this patch renames the
build options. The list of changes is as follows:

- Remove the enable prefix from boolean options.
- The character separator from multi-word options has been changed
  to underscore.

https://bugzilla.gnome.org/show_bug.cgi?id=790234

configure

@@ -159,7 +159,7 @@ END
 
 cmd_options=""
 for key in "${!meson_options[@]}"; do
-    cmd_options="$cmd_options -Denable-$key=${meson_options[$key]}"
+    cmd_options="$cmd_options -D${key/\-/_}=${meson_options[$key]}"
 done
 
 exec ${MESON} \

meson.build

@@ -36,8 +36,8 @@ calendar_schemadir = join_paths(calendar_datadir, 'glib-2.0', 'schemas')
 
 calendar_buildtype = get_option('buildtype')
 calendar_debug = calendar_minor_version.is_odd() or buildtype.contains('debug')
-enable_tracing = get_option('enable-tracing')
-enable_gtk_doc = get_option('enable-gtk-doc')
+enable_tracing = get_option('tracing')
+enable_gtk_doc = get_option('gtk_doc')
 
 cc = meson.get_compiler('c')
 

meson_options.txt

@@ -1,2 +1,2 @@
-option('enable-tracing', type: 'boolean', value: false, description: 'add extra debugging information')
-option('enable-gtk-doc', type: 'boolean', value: false, description: 'use gtk-doc to build documentation')
+option('tracing', type: 'boolean', value: false, description: 'add extra debugging information')
+option('gtk_doc', type: 'boolean', value: false, description: 'use gtk-doc to build documentation')