sanity.bbclass: check host tool dependencies on change in NATIVELSBSTRING
When a user upgrades their host distro, it may no longer have all the
required tools installed, but this won't be caught by bitbake resulting
in possible build errors. Rather than check for installed tools on every
startup, use the NATIVELSBSTRING change as indicator to rescan for host
tool dependencies. Store the NATIVELSBSTRING in the sanity_info file.
[YOCTO #8585]
Signed-off-by: Bill Randle <william.c.randle@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
