Toolchain+Ports: Consolidate version information for QEMU

This consolidates version information, archive's download location,
filename and SHA256 checksum into version.sh. This file is then sourced
from the port script and toolchain build script.

The version.sh script contains the following variables:
- QEMU_VERSION           - Version number
- QEMU_ARCHIVE           - Filename
- QEMU_ARCHIVE_URL       - Full url to download location
- QEMU_ARCHIVE_SHA256SUM - The SHA256 checksum

Ports/qemu/package.sh

@@ -1,6 +1,9 @@
 #!/usr/bin/env -S bash ../.port_include.sh
+
+source version.sh
+
 port='qemu'
-version='7.2.0'
+version="${QEMU_VERSION}"
 useconfigure='true'
 configopts=(
     '--target-list=aarch64-softmmu,i386-softmmu,x86_64-softmmu'
@@ -20,8 +23,8 @@ depends=(
   'pixman'
   'SDL2'
 )
-files="https://download.qemu.org/qemu-${version}.tar.xz qemu-${version}.tar.xz 5b49ce2687744dad494ae90a898c52204a3406e84d072482a1e1be854eeb2157"
 auth_type='sha256'
+files="${QEMU_ARCHIVE_URL} ${QEMU_ARCHIVE} ${QEMU_ARCHIVE_SHA256SUM}"
 
 pre_patch() {
     # Disable tests (those need way more stuff than QEMU itself) by clearing the respective meson file.

Ports/qemu/version.sh

@@ -0,0 +1,4 @@
+QEMU_VERSION="7.2.0"
+QEMU_ARCHIVE="qemu-${QEMU_VERSION}.tar.xz"
+QEMU_ARCHIVE_URL="https://download.qemu.org/${QEMU_ARCHIVE}"
+QEMU_ARCHIVE_SHA256SUM="5b49ce2687744dad494ae90a898c52204a3406e84d072482a1e1be854eeb2157"