attempt to fix systemd clang comp

.github/workflows/build.yml

@@ -103,7 +103,7 @@ jobs:
   
   build_linux:
     name: Build OpenStarbound Linux x86_64
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     if: ${{ (github.event_name != 'workflow_dispatch') || (inputs.linux == true) }}
     env:
         CC: clang

source/vcpkg.json

@@ -2,8 +2,7 @@
   "$schema": "https://raw.githubusercontent.com/microsoft/vcpkg-tool/main/docs/vcpkg.schema.json",
   "dependencies": [
     "glew",
-    { "name": "sdl2", "default-features": false, "features": ["wayland", "x11", "alsa"], "platform": "linux" },
-    { "name": "sdl2", "platform": "!linux" },
+    "sdl2",
     "libvorbis",
     "zlib",
     "freetype",

triplets/x64-linux-mixed.cmake

@@ -9,6 +9,11 @@ if(PORT MATCHES "discord-")
     set(VCPKG_LIBRARY_LINKAGE dynamic)
 endif()
 
+if(PORT MATCHES "libsystemd")
+    set(VCPKG_C_FLAGS "-std=c11")
+    set(VCPKG_CXX_FLAGS "-std=c11")
+endif()
+
 if(PORT MATCHES "opus")
   string(CONCAT VCPKG_CMAKE_CONFIGURE_OPTIONS
     "-DOPUS_INSTALL_PKG_CONFIG_MODULE=OFF"