Clean up include Makefile:

 - use .for loops instead of shell for loops. This means we can be
   shown what is happening while it's going, rather than some pacifier
   "echo" statement.
 - use "${INSTALL} -C", nuke the "cmp -s" hack
 - for "copies" mode,  the include files are no longer touched each time
   the world is built. (ie: no rm -rf.  symlinks are removed, mtree builds
   the new dirs or confirms the existing ones)
 - osreldate.h is build in the local dir and conditionally installed,
   rather than built in /usr/include and either renamed or deleted.

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