Always include <cstdint> to fix bitsery+GCC 13

This used to be a transitive include but it no longer is. Fixes #249.

CHANGELOG.md

@@ -6,6 +6,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic
 Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Packaging notes
+
+- This release includes a workaround to make bitsery compile with GCC 13 due to
+  changes in transitive header includes.
+
 ## [5.0.5] - 2023-05-07
 
 ### Changed

meson.build

@@ -60,6 +60,11 @@ compiler_options = [
   # CPUs, but when we're compiling the 32-bit bitbridge we need to manually add
   # this flag.
   '-msse2',
+  # FIXME: Bitsery relies on the definitions from `<cstdint>`, which is no
+  #        longer included transitively with GCC 13. This should be removed once
+  #        bitsery is updated to support GCC 13.
+  '-include',
+  'cstdint',
 ]
 
 chainloader_compiler_options = [