5025 import and use mandoc
Reviewed by: Hans Rosenfeld <hans.rosenfeld@nexenta.com>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Albert Lee <trisk@nexenta.com>
Approved by: TBD

*** 944,953 ****
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  #
  # This is only used during the -t tools build
  #
  opt/onbld/bin/i386/elfsign      i386
  opt/onbld/bin/sparc/elfsign     sparc
+ opt/onbld/bin/i386/mandoc       i386
+ opt/onbld/bin/sparc/mandoc      sparc
  
  #
  # Private libdwarf
  #
  opt/onbld/lib/i386/libdwarf.so  i386