Backout svn r183528.
Backout svn r183528.

SRCDIR is seeded from `pwd` which not only means src/sys/ but
also src/include/ (and possibly src/usr.sbin/amd/include/ ?).
Trying to build world resulted in

  ===> include (includes)
  cd /usr/src/include; make buildincludes; make installincludes
  creating osreldate.h from newvers.sh
  cd: can't cd to /usr/src/include/sys
  *** Error code 2

as there is apparently no src/include/sys.

There are multiple possible solutions ranging from seeding SRCDIR from
the environment to adding more substitution patterns.

Reported by:						sam, bz
Proper solution to be implemented and tested by:	peter

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