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
Use single quotes for non-interpolated strings in the 'configopts' and
'depends' sections.
Let each dependency of the 'depends' section be on a separate line.
While this loses quite a bit of accuracy (although to no apparent
decrease in emulation quality) , it helps avoiding the additional
overhead of the `clock_gettime` syscall (as `CLOCK_MONOTONIC_COARSE`
is forwarded using the mapped time page) and we don't have to do a
HPET timer read for each tick.
This results in a decrease of Serenity boot time from 1h16m down to
42m when running on Serenity.
