meson: Add pest rust dependencies

Including its dependency ucd-trie.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: @LingMan
Reviewed-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28869>

subprojects/packagefiles/ucd-trie/meson.build

@@ -0,0 +1,14 @@
+project(
+  'ucd_trie',
+  'rust',
+  version : '0.1.6',
+  license : '(MIT or Apache-2.0) AND Unicode-DFS-2016)',
+)
+
+lib = static_library(
+  'ucd_trie',
+  'src/lib.rs',
+  override_options : ['rust_std=2018', 'build.rust_std=2018'],
+  rust_abi : 'rust',
+  native : true,
+)