qemu: update to 7.0.0

release notes:
- https://www.qemu.org/2022/04/19/qemu-7-0-0/

packages/tools/qemu/package.mk

@@ -2,8 +2,8 @@
 # Copyright (C) 2016-present Team LibreELEC (https://libreelec.tv)
 
 PKG_NAME="qemu"
-PKG_VERSION="6.2.0"
-PKG_SHA256="68e15d8e45ac56326e0b9a4afa8b49a3dfe8aba3488221d098c84698bca65b45"
+PKG_VERSION="7.0.0"
+PKG_SHA256="f6b375c7951f728402798b0baabb2d86478ca53d44cedbefabbe1c46bf46f839"
 PKG_LICENSE="GPL"
 PKG_SITE="https://www.qemu.org"
 PKG_URL="https://download.qemu.org/qemu-${PKG_VERSION}.tar.xz"
@@ -34,7 +34,6 @@ pre_configure_host() {
     --disable-docs \
     --disable-gcrypt \
     --disable-gnutls \
-    --disable-libxml2 \
     --disable-system \
     --disable-user \
     --disable-vnc \