umockdev 0.9.4 changed how to test for running in mock and this
causes the assumptions on mock testing at init to fail.

Move the test for this to after the environment has been set up.

Add lots of code because it's not cool to hard depend on appstream-glib master.

If read the specification correctly it's supposed to be 0x0110 i.e. 1.10,
rather than 1.01 -- just work around it as it seems a common enough mistake.

Fixes split into more than 0xff chunks were being truncated as uint8_t was the
wrong index type.

Fixes:
[1/182] /bin/tar --xform 's,.*/,,' --create --file data/tests/builder/firmware.tar ../fwupd-1.0.0/data/tests/builder/source.bin ../fwupd-1.0.0/data/tests/builder/startup.sh
FAILED: data/tests/builder/firmware.tar
/bin/tar --xform 's,.*/,,' --create --file data/tests/builder/firmware.tar ../fwupd-1.0.0/data/tests/builder/source.bin ../fwupd-1.0.0/data/tests/builder/startup.sh
/bin/tar: ../fwupd-1.0.0/data/tests/builder/source.bin: Member name contains '..'
/bin/tar: ../fwupd-1.0.0/data/tests/builder/startup.sh: Member name contains '..'
/bin/tar: Exiting with failure status due to previous errors

Fixes: https://github.com/hughsie/fwupd/issues/270

This was causing problems building on Jessie, and turns out to be unused
anyway:
   AttributeError: 'gi.repository.PangoCairo' object has no attribute 'font_map_get_default'
Signed-off-by: Philip Withnall <withnall@endlessm.com>

By removing the device from the hash table before we add it to the devices
array we could inadvertently drop the last object reference if the plugin is
not using the (optional) cache.

Just re-arrange things to fix https://github.com/hughsie/fwupd/issues/259

Fixes: https://github.com/hughsie/fwupd/issues/257

UEFI updates don't need to be retried since a785a1c2. If the call to Install()
failed with NOT_SUPPORTED we can just show the error rather than doing the
little dance and involving the offline pending database for no reason.

Fixes some of https://github.com/hughsie/fwupd/issues/255

This allows us to 'unschedule' any offline updates.

Instead, put the failing version number in the error message where it belongs.

Prevents a warning about PRODUCT not existing when the usb plugin is disabled.

Fixes: https://github.com/hughsie/fwupd/issues/235

The HAVE_UEFI_UNLOCK and HAVE_UEFI_GUID defines are always present for the
libfwup version we require.

For reference, we depend on at least 0.5...

The GCancellable object is in gio-2.0.