gnu: qemu: Update to 8.1.0.

* gnu/packages/virtualization.scm (qemu): Update to 8.1.0.
[source] <patches>: Replace qemu-disable-aarch64-migration-test.patch with
qemu-disable-some-qtests-tests.patch.
<snippet>: Adjust for dtc relocation and meson and sgabios removal.
[arguments] <configure-flags>: Remove --meson flag.  Remove sgabios from the
--firmwarepath value.
<phases>: Adjust replace-firmwares and delete-firmwares phases for sgabios
removal.
[inputs]: Remove sgabios.
(qemu-minimal): Use package/inherit, which is more appropriate for a package
variant.
[arguments]: New disable-extra-tests phase.
* gnu/packages/patches/qemu-disable-aarch64-migration-test.patch: Delete file.
* gnu/packages/patches/qemu-disable-some-qtests-tests.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.

Reviewed-by: Kaelyn <kaelyn.alexi@protonmail.com>

gnu/packages/patches/qemu-disable-some-qtests-tests.patch

@@ -0,0 +1,52 @@
+Disable the qtest-aarch64/migration-test, which sometimes fail
+non-deterministically (see:
+https://gitlab.com/qemu-project/qemu/-/issues/1230).
+
+Also disable the bios-tables-test, which may fail on older machines (see:
+https://gitlab.com/qemu-project/qemu/-/issues/1098).
+
+--- qemu-8.1.0/tests/qtest/meson.build.old	2023-08-30 11:48:27.871146249 -0400
++++ qemu-8.1.0/tests/qtest/meson.build	2023-08-30 13:53:25.994084948 -0400
+@@ -1,6 +1,5 @@
+ slow_qtests = {
+   'ahci-test' : 60,
+-  'bios-tables-test' : 120,
+   'boot-serial-test' : 60,
+   'migration-test' : 150,
+   'npcm7xx_pwm-test': 150,
+@@ -81,9 +80,6 @@
+    config_all_devices.has_key('CONFIG_Q35') and                                             \
+    config_all_devices.has_key('CONFIG_VIRTIO_PCI') and                                      \
+    slirp.found() ? ['virtio-net-failover'] : []) +                                          \
+-  (unpack_edk2_blobs and                                                                    \
+-   config_all_devices.has_key('CONFIG_HPET') and                                            \
+-   config_all_devices.has_key('CONFIG_PARALLEL') ? ['bios-tables-test'] : []) +             \
+   qtests_pci +                                                                              \
+   qtests_cxl +                                                                              \
+   ['fdc-test',
+@@ -212,7 +208,6 @@
+
+ # TODO: once aarch64 TCG is fixed on ARM 32 bit host, make bios-tables-test unconditional
+ qtests_aarch64 = \
+-  (cpu != 'arm' and unpack_edk2_blobs ? ['bios-tables-test'] : []) +                            \
+   (config_all.has_key('CONFIG_TCG') and config_all_devices.has_key('CONFIG_TPM_TIS_SYSBUS') ?            \
+     ['tpm-tis-device-test', 'tpm-tis-device-swtpm-test'] : []) +                                         \
+   (config_all_devices.has_key('CONFIG_XLNX_ZYNQMP_ARM') ? ['xlnx-can-test', 'fuzz-xlnx-dp-test'] : []) + \
+@@ -222,8 +217,7 @@
+    config_all_devices.has_key('CONFIG_TPM_TIS_I2C') ? ['tpm-tis-i2c-test'] : []) + \
+   ['arm-cpu-features',
+    'numa-test',
+-   'boot-serial-test',
+-   'migration-test']
++   'boot-serial-test']
+
+ qtests_s390x = \
+   qtests_filter + \
+@@ -301,7 +295,6 @@
+ endif
+
+ qtests = {
+-  'bios-tables-test': [io, 'boot-sector.c', 'acpi-utils.c', 'tpm-emu.c'],
+   'cdrom-test': files('boot-sector.c'),
+   'dbus-vmstate-test': files('migration-helpers.c') + dbus_vmstate1,
+   'erst-test': files('erst-test.c'),