[oe] This mornings build errors

[Koen Kooi]

Hi,

I updated this morning and get:

   File "<bb>", line 2, in build_package_revision
NameError: global name 'bb' is not defined
ERROR: Task 18 
(/OE/org.openembedded.dev/packages/linux-libc-headers/linux-libc-headers_2.6.23.bb, 
do_package_write_ipk) failed

If you are going to use bb.<foo> in a class you will need to do 'import 
bb'. Especially in package.bbclass where you can break builds for everyone.