qemu: Fix padding in host_sigevent

The struct should be padded to 64 bytes but instead it was padded to
(sizeof(int) * (64 - 2 * sizeof(int) + sizeof(union sigval))).

Assuming both int and pointer types are 64 bits, that leads to a padding
of 448 bytes.

srcpkgs/qemu/patches/musl-fix-sigevent-and-sigval_t.patch

@@ -1,5 +1,7 @@
---- a/linux-user/syscall.c.orig    2015-04-10 07:10:06.305662505 +0000
-+++ b/linux-user/syscall.c 2015-04-10 07:36:53.801871968 +0000
+Note: Remove this patch with musl 1.2.2
+
+--- a/linux-user/syscall.c
++++ b/linux-user/syscall.c
 @@ -5020,9 +5020,20 @@
      return 0;
  }
@@ -10,7 +12,7 @@
 +    int sigev_signo;
 +    int sigev_notify;
 +    union {
-+       int _pad[64-sizeof(int) * 2 + sizeof(union sigval)];
++       char _pad[64 - sizeof(int) * 2 - sizeof(union sigval)];
 +       int _tid;
 +    } _sigev_un;
 +};

srcpkgs/qemu/template

@@ -2,7 +2,7 @@
 # This package should be updated together with qemu-user-static
 pkgname=qemu
 version=6.1.0
-revision=2
+revision=3
 build_style=configure
 hostmakedepends="gettext pkg-config perl python3 automake libtool flex
  python3-Sphinx python3-sphinx_rtd_theme texinfo ninja"