build: Remove duplicate definition

The `GTK_COMPILATION` symbol is defined in gir_args.

diff --git a/gtk/meson.build b/gtk/meson.build
index ffadb282670017d68295d3247d53ffed7049f596..7d2d1e1c83242bf37f7f46181419f45afb155010 100644 (file)
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -1231,9 +1231,7 @@ if build_gir
                                header: 'gtk/gtk.h',
                                install: true,
                                dependencies: gsk_gir_dep,
-                               extra_args: gir_args + [
-                                 '-DGTK_COMPILATION',
-                               ])
+                               extra_args: gir_args)
   gtk_dep_sources += gtk_gir
 endif