build: Don’t pass false to install_dir

This fixes a Meson deprecation warning which appeared in Meson 0.50.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

gobject/meson.build

@@ -159,6 +159,7 @@ configure_file(
   output: 'libgobject-2.0.so.@0@-gdb.py'.format(library_version),
   configuration: gdb_conf,
   install_dir: gdb_install_dir,
+  install: gdb_install,
 )
 
 if enable_systemtap