guint adw_get_major_version ( void )
Returns the major version number of the Adwaita library.
For example, in libadwaita version 1.2.3 this is 1.
This function is in the library, so it represents the libadwaita library your
code is running against. Contrast with the
which represents the major version of the libadwaita headers you have
included when compiling your code.