libvpx: use `ENV.runtime_cpu_detection`

Closes #85539.

Signed-off-by: Nanda H Krishna <me@nandahkrishna.com>
Signed-off-by: BrewTestBot <1589480+BrewTestBot@users.noreply.github.com>

Formula/libvpx.rb

@@ -28,6 +28,11 @@ class Libvpx < Formula
       --enable-vp9-highbitdepth
     ]
 
+    if Hardware::CPU.intel?
+      ENV.runtime_cpu_detection
+      args << "--enable-runtime-cpu-detect"
+    end
+
     # https://bugs.chromium.org/p/webm/issues/detail?id=1475
     args << "--disable-avx512" if MacOS.version <= :el_capitan
 

style_exceptions/runtime_cpu_detection_allowlist.json

@@ -1,5 +1,6 @@
 [
   "apache-arrow",
   "fftw",
+  "libvpx",
   "openblas"
 ]