Regenerate some target description files

I regenerated all target description .c files from scratch, and got
this spurious diff.

It's a simple mid-air collision - these files were clearly generated
before commit 73b4f516 ("maint_print_c_tdesc_cmd: Use type for
TYPE_CODE_FLAGS instead of field_type."), which did the global
s/field_type/type/, and pushed to master afterwards.

gdb/features/ChangeLog:
2016-08-08  Pedro Alves  <palves@redhat.com>

	* features/i386/amd64-avx-mpx-linux.c: Regenerate.
	* features/i386/amd64-avx-mpx.c: Regenerate.
	* features/i386/i386-avx-mpx-linux.c: Regenerate.
	* features/i386/i386-avx-mpx.c: Regenerate.