I noticed that regformats/i386/i386-avx.dat did not get re-generated
when doing "make" in the features directory. I think it's a leftover
from commit
f5a29eb0a6 ("Clean up x86 non-linux GDBserver target descriptions")
I build-tested gdbserver with amd64 and i386.
gdb/ChangeLog:
* regformats/i386/i386-avx.dat: Remove.