openh264: fix build for FreeBSD (#387688)

pkgs/by-name/op/openh264/package.nix

@@ -1,6 +1,7 @@
 {
   lib,
   fetchFromGitHub,
+  fetchpatch,
   gtest,
   meson,
   nasm,
@@ -26,6 +27,15 @@ stdenv.mkDerivation (finalAttrs: {
     "dev"
   ];
 
+  patches = [
+    # https://github.com/cisco/openh264/pull/3867
+    (fetchpatch {
+      name = "freebsd-configure.patch";
+      url = "https://github.com/cisco/openh264/commit/ea8a1ad5791ee5c4e2ecf459aec235128d69b35b.patch";
+      hash = "sha256-pJvh9eRxFZQ+ob4WPu/x+jr1CCpgnug1uBViLfAtBDg=";
+    })
+  ];
+
   nativeBuildInputs = [
     meson
     nasm
@@ -58,6 +68,6 @@ stdenv.mkDerivation (finalAttrs: {
         ++ lib.platforms.aarch64
         ++ lib.platforms.loongarch64
         ++ lib.platforms.riscv64
-      ) (lib.platforms.linux ++ lib.platforms.darwin);
+      ) lib.platforms.unix;
   };
 })