class/autotools: Support specification of custom path to configure script
class/autotools: Support specification of custom path to configure script

Add ${CONFIGURE_SCRIPT} variable, which can be overriden with a custom
path to configure script.

sknsean/core,hundeboll/core,sknsean/core,sknsean/core,hundeboll/core,hundeboll/core,hundeboll/core,diorcety/oe-lite-core,sknsean/core,diorcety/oe-lite-core,sknsean/core