When the sstate hash changes for do_configure task, the do_configure
default implementation triggers the 'clean' to be run. For it to
succeed we need to have KERNEL_SRC defined in EXTRA_OEMAKE. Fixes
following error:
,----
| DEBUG: Executing shell function do_configure
| NOTE: make -e MAKEFLAGS= clean
| make -C M=.../tmp/work/... clean
| make[1]: *** M=.../tmp/work/...: No such file or directory. Stop.
| Makefile:20: recipe for target 'clean' failed
| make: *** [clean] Error 2
| ERROR: oe_runmake failed
`----
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
