Implement shader archive decompressor for the build system. (#466)

* Implement shader archive decompressor for the build system.

* Fix Linux compilation error.

flatpak/io.github.hedge_dev.unleashedrecomp.json

@@ -52,6 +52,11 @@
           "type": "file",
           "path": "private/shader.ar",
           "dest": "UnleashedRecompLib/private"
+        },
+        {
+          "type": "file",
+          "path": "private/shader_decompressed.ar",
+          "dest": "UnleashedRecompLib/private"
         }
       ],
       "build-options": {