meson: complete introspection build config

Pass the same config to gobject-introspection as with cmake/autotools.

This makes sure the c-include and package name is included in the gir
and also fixes the build because of the missing HB_AAT_H* defines.

Fixes #2336

src/meson.build

@@ -566,14 +566,18 @@ if have_gobject
       namespace: 'HarfBuzz',
       nsversion: '0.0',
       identifier_prefix: 'hb_',
-      symbol_prefix: 'hb_',
+      symbol_prefix: ['hb', 'hb_gobject'],
       includes: ['GObject-2.0'],
+      export_packages: ['harfbuzz-gobject'],
+      header: 'hb-gobject.h',
       install: true,
       extra_args:  ['--cflags-begin',
                     '-DHB_H',
                     '-DHB_H_IN',
                     '-DHB_OT_H',
                     '-DHB_OT_H_IN',
+                    '-DHB_AAT_H',
+                    '-DHB_AAT_H_IN',
                     '-DHB_GOBJECT_H',
                     '-DHB_GOBJECT_H_IN',
                     '-DHB_EXTERN=',