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