In commit 232d7a5e we almost got
the detection logic right. However, the XGETBV instruction would
crash if Linux was started up with the option noxsave.

have_vpclmulqdq(): Check for the XSAVE flag at the correct position
and also for the AVX flag.

This was tested on Ubuntu 22.04 by starting up its Linux 5.15 kernel
with and without the noxsave option.