remove unused option from discord wrap

Author: Totto16

subprojects/packagefiles/discord_game_sdk/meson_options.txt

@@ -6,10 +6,3 @@ option(
     value: false,
     description: 'whether to built the examples',
 )
-
-option(
-    'clang_libcpp',
-    type: 'feature',
-    value: 'auto',
-    description: 'if using clang, build with libc++ instead of libstdc++ (gcc stdlib)',
-)