meson: Rename to deprecated-weston-launch

This ensures that users that previously set the option explicitly will also have
a chance to notice the deprecation.

Signed-off-by: Kenny Levinsen <kl@kl.wtf>

libweston/meson.build

@@ -228,7 +228,7 @@ dep_vertex_clipping = declare_dependency(
 	include_directories: include_directories('.')
 )
 
-if get_option('weston-launch')
+if get_option('deprecated-weston-launch')
 	warning('weston-launch is deprecated and will be removed in a future release. Please migrate to libseat and seatd-launch.')
 	dep_pam = cc.find_library('pam')
 

meson_options.txt

@@ -66,7 +66,7 @@ option(
 )
 
 option(
-	'weston-launch',
+	'deprecated-weston-launch',
 	type: 'boolean',
 	value: false,
 	description: 'Deprecated weston launcher for systems without logind'