meson: specify minimum required version

The minimum version in practice used to be 0.50.0, however that can be
lowered by removing unneeded kwargs from a couple of functions.

- i18n.gettext() `install_dir` defaults to the localedir option, and
  doesn't need to be manually overridden to that location

- configure_file() `install` defaults to true if `install_dir` is set,
  and before 0.50 that was also the *only* way to mark it as installed

Removing both these kwargs means that there is more leeway with the minimum
required version.

meson.build

@@ -1,6 +1,7 @@
 project(
   'lutris',
-  license: 'GPL-3.0-or-later'
+  license: 'GPL-3.0-or-later',
+  meson_version: '>=0.46.0',
 )
 
 # Find Python installation
@@ -24,7 +25,6 @@ configure_file(
   input: 'optional_settings.py.in',
   output: 'optional_settings.py',
   configuration: config,
-  install: true,
   install_dir: lutrisdir,
 )
 

po/meson.build

@@ -2,6 +2,5 @@ i18n = import('i18n')
 
 i18n.gettext(
   'lutris',
-  install_dir: localedir,
   args: '--from-code=UTF-8'
 )