multimedia/rav1e: drop old lang/rust workaround

multimedia/rav1e/files/patch-build.rs

@@ -1,40 +0,0 @@
-error: failed to run custom build command for `rav1e v0.4.0 (/wrkdirs/usr/ports/multimedia/librav1e/work/rav1e-0.4.0)`
-
-Caused by:
-  process didn't exit successfully: `/wrkdirs/usr/ports/multimedia/librav1e/work/target/release/build/rav1e-b2f4b3ce116fbed0/build-script-build` (exit code: 101)
-  --- stderr
-  thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: LlvmVersionError(TooManyComponents)', build.rs:179:16
-  stack backtrace:
-     0: rust_begin_unwind
-     1: core::panicking::panic_fmt
-     2: core::result::unwrap_failed
-     3: core::result::Result<T,E>::unwrap
-               at /wrkdirs/usr/ports/lang/rust/work/rustc-1.51.0-src/library/core/src/result.rs:1037:23
-     4: build_script_build::rustc_version_check
-               at ./build.rs:179:6
-     5: build_script_build::main
-               at ./build.rs:268:3
-     6: core::ops::function::FnOnce::call_once
-               at /wrkdirs/usr/ports/lang/rust/work/rustc-1.51.0-src/library/core/src/ops/function.rs:227:5
-  note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
-
---- build.rs.orig	2023-12-30 17:12:06 UTC
-+++ build.rs
-@@ -236,17 +236,6 @@ fn rustc_version_check() {
- }
- 
- fn rustc_version_check() {
--  // This should match the version in the CI
--  // Make sure to updated README.md when this changes.
--  const REQUIRED_VERSION: &str = "1.70.0";
--  if version().unwrap() < Version::parse(REQUIRED_VERSION).unwrap() {
--    eprintln!("rav1e requires rustc >= {REQUIRED_VERSION}.");
--    exit(1);
--  }
--
--  if version_meta().unwrap().channel == Channel::Nightly {
--    println!("cargo:rustc-cfg=nightly_rustc");
--  }
- }
- 
- #[allow(unused_variables)]