autorevision broken on tarballs

[Hal Murray]

I made the tarball in my working directory so things may have been confused 
by stuff that distclean didn't clean.

 1290  ./waf dist
 1291  ll noname-1.0.tar.bz2 
 1292  mkdir ../foo
 1293  mv noname-1.0.tar.bz2 ../foo/
 1294  cd ../foo/
 1295  ll
 1296  tar -xvf noname-1.0.tar.bz2 
 1297  cd noname-1.0/
 1298  ./waf configure build

[ 81/109] Compiling build/host/ntpd/ntp_parser.tab.c
In file included from ../../ntpd/ntpd.c:34:0:
../../ntpd/version.h:17:33: error: ‘True’ undeclared here (not in a function)
 const int VCS_WC_MODIFIED     = True;
                                 ^~~~


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