feat: added alvr fork

patches/fix-finding-libs.patch

@@ -0,0 +1,31 @@
+diff --git a/alvr/server_openvr/build.rs b/alvr/server_openvr/build.rs
+index 2573d07e..130cfcce 100644
+--- a/alvr/server_openvr/build.rs
++++ b/alvr/server_openvr/build.rs
+@@ -1,24 +1,12 @@
+ use std::{env, path::PathBuf};
+ 
+ fn get_ffmpeg_path() -> PathBuf {
+-    let ffmpeg_path = alvr_filesystem::deps_dir()
+-        .join(if cfg!(target_os = "linux") {
+-            "linux"
+-        } else {
+-            "windows"
+-        })
+-        .join("ffmpeg");
+-
+-    if cfg!(target_os = "linux") {
+-        ffmpeg_path.join("alvr_build")
+-    } else {
+-        ffmpeg_path
+-    }
++    PathBuf::from("@ffmpeg@")
+ }
+ 
+ #[cfg(all(target_os = "linux", feature = "gpl"))]
+ fn get_linux_x264_path() -> PathBuf {
+-    alvr_filesystem::deps_dir().join("linux/x264/alvr_build")
++    PathBuf::from("@x264@")
+ }
+ 
+ fn main() {