K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2014-12-15T14:25:42.326836Z
K 7
svn:log
V 462
Remove empty generated file upon gperf failure

Prior to this change the build could fail as follows, if gperf is not
available (or fails):

  - make(1) stops due to the gperf error, but an empty target file
    (cfns.h) is still created
  - the empty cfns.h is newer than the source cfns.gperf so it is not
    regenerated on subsequent builds
  - the gcc build fails (undefined reference to libc_name_p)

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days

END