Updates for current upstream layers

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
ptest.bbclass: drop, upstream has the fix

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
cml1.bbclass: drop, as upstream fixed it differently

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
valgrind: kill unneeded external toolchain patch

3.8.1's version check is less brittle, it seems.

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
setup-environment: always unset OPTIONALLAYERS

This ensures we never have a remnant OPTIONLLAYERS hanging around from
a different MEL version affecting another.

JIRA: SB-959

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
wpa-supplicant: drop bbappend

Signed-off-by: Christopher Larson <chris_larson@mentor.com>