PR/49437: jmcneill: revert broken changes that broke SIOCGIFCONF (mdnsd uses it)
PR toolchain/9618: add ".d" to MKDEP_SUFFIXES so the depend files are rebuilt
if any of their dependencies (i.e. the files they refer to) are changed.
This allows changes to transitive included headers to be handled properly.
Handle obsolete xen/pae-xen kernel modules; reported by John D. Baker.