webrtc-audio-processing: enable powerpc64le

This commit enables powerpc64le for webrtc-audio-processing, following
the pattern established by riscv64 support in f13cf5ef47.

pkgs/development/libraries/webrtc-audio-processing/0.3.nix

@@ -9,7 +9,10 @@ stdenv.mkDerivation rec {
     sha256 = "1gsx7k77blfy171b6g3m0k0s0072v6jcawhmx1kjs9w5zlwdkzd0";
   };
 
-  patches = [ ./enable-riscv.patch ];
+  patches = [
+    ./enable-riscv.patch
+    ./enable-powerpc.patch
+  ];
 
   buildInputs = lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [ ApplicationServices ]);
 

pkgs/development/libraries/webrtc-audio-processing/enable-powerpc.patch

@@ -0,0 +1,37 @@
+This patch was extracted from the Gentoo powerpc64le-qtwebengine
+patchset, referenced here:
+
+  https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-qt/qtwebengine/qtwebengine-5.15.3_p20220406.ebuild
+
+and downloaded from here:
+
+  https://dev.gentoo.org/~asturm/distfiles/${PN}-5.15.3_p20220406-patchset.tar.xz
+
+From 4bbb4482e14ad27cf0bd5032b1b5d4abba29dc99 Mon Sep 17 00:00:00 2001
+From: Georgy Yakovlev <gyakovlev@gentoo.org>
+Date: Fri, 27 Nov 2020 13:05:45 -0800
+Subject: [PATCH] 5.15.2 ppc64le patchet
+
+diff --git a/webrtc/typedefs.h b/webrtc/typedefs.h
+index ce1f3e8..fd39a16 100644
+--- a/webrtc/typedefs.h
++++ b/webrtc/typedefs.h
+@@ -38,6 +38,18 @@
+ #define WEBRTC_ARCH_X86
+ #define WEBRTC_ARCH_32_BITS
+ #define WEBRTC_ARCH_LITTLE_ENDIAN
++#elif defined(__PPC__)
++#define WEBRTC_ARCH_PPC_FAMILY
++#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
++#define WEBRTC_ARCH_LITTLE_ENDIAN
++#else
++#define WEBRTC_ARCH_BIG_ENDIAN
++#endif
++#if defined(__LP64__)
++#define WEBRTC_ARCH_64_BITS
++#else
++#define WEBRTC_ARCH_32_BITS
++#endif
+ #elif defined(__ARMEL__)
+ // TODO(ajm): We'd prefer to control platform defines here, but this is
+ // currently provided by the Android makefiles. Commented to avoid duplicate