classes/arch: Lazyassign empty string to HOST_EXEEXT and TARGET_EXEEXT
classes/arch: Lazyassign empty string to HOST_EXEEXT and TARGET_EXEEXT

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