mumble: Fix 32-bit build

32-bit builds fail due to the following error. Apply a patch from master
to fix the issue.

[ 25%] Building CXX object plugins/gtav/CMakeFiles/gtav.dir/gtav.cpp.o
In file included from /build/source/plugins/gtav/Game.h:9,
                 from /build/source/plugins/gtav/gtav.cpp:6:
/build/source/plugins/gtav/structs.h:218:37: error: static assertion failed
  218 | static_assert(sizeof(CCameraAngles) == 0x408, "");
      |               ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
/build/source/plugins/gtav/structs.h:218:37: note: the comparison reduces to '(1028 == 1032)'

Signed-off-by: Felix Singer <felixsinger@posteo.net>

pkgs/applications/networking/mumble/0002-FIX-positional-audio-Force-8-bytes-alignment-for-CCa.patch

@@ -0,0 +1,31 @@
+From 13c051b36b387356815cff5d685bc628b74ba136 Mon Sep 17 00:00:00 2001
+From: Davide Beatrici <git@davidebeatrici.dev>
+Date: Thu, 1 Sep 2022 23:32:57 +0200
+Subject: [PATCH] FIX(positional-audio): Force 8 bytes alignment for
+ CCameraAngles in GTAV plugin
+
+https://en.cppreference.com/w/cpp/language/alignas
+
+This fixes compilation when the implicit alignment is not 8 bytes.
+
+It can be the case with 32 bit targets.
+---
+ plugins/gtav/structs.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/plugins/gtav/structs.h b/plugins/gtav/structs.h
+index 2829dc11e..0e4f76eda 100644
+--- a/plugins/gtav/structs.h
++++ b/plugins/gtav/structs.h
+@@ -118,7 +118,7 @@ struct CCameraManagerAngles {
+ 	ptr_t cameraAngles; // CCameraAngles *
+ };
+ 
+-struct CCameraAngles {
++struct alignas(8) CCameraAngles {
+ 	uint8_t pad1[960];
+ 	ptr_t playerAngles; // CPlayerAngles *
+ 	uint8_t pad2[60];
+-- 
+2.38.5
+

pkgs/applications/networking/mumble/default.nix

@@ -22,6 +22,7 @@ let
 
     patches = [
       ./0001-BUILD-crypto-Migrate-to-OpenSSL-3.0-compatible-API.patch
+      ./0002-FIX-positional-audio-Force-8-bytes-alignment-for-CCa.patch
     ];
 
     nativeBuildInputs = [ cmake pkg-config python3 qt5.wrapQtAppsHook qt5.qttools ]