scripts/hob: disable sanity checks when launching

This enables us to use the GUI to change any settings which might cause
sanity checks to fail, such as the proxy configuration.

(From OE-Core rev: fe98d1c7159636f123b27292bbd4cc224b532bf0)

Signed-off-by: Joshua Lock <josh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/hob

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-bitbake -u hob
+export BB_ENV_EXTRAWHITE="DISABLE_SANITY_CHECKS $BB_ENV_EXTRAWHITE"
+DISABLE_SANITY_CHECKS=1 bitbake -u hob
 
 ret=$?
 exit $ret