externalsrc/devtool: Fix to work with fixed export funcition flags handling
If we fix bitbake to correctly handle the cleandirs and fakeroot flags
for tasks handled by EXPORT_FUNCTIONS, we break devtool since it only
considers these for top level functions. Add in extra code to intercept
the cleandirs flags for commonly used sub functions too.
[YOCTO #8621]
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>