make j12 broken - uniconv.h not created.

[Thomas D. Dean]

> cd octave
> hg update
> cd ../octave-build
> Rm -Rf *
> ../octave/configure F77=gfortran
...
> make -j12
...
  CC 
liboctave/wrappers/liboctave_wrappers_libwrappers_la-wait-for-input.lo
  CC 
liboctave/wrappers/liboctave_wrappers_libwrappers_la-wait-wrappers.lo
  CXX      src/src_mkoctfile-mkoctfile.o
  CC       src/src_octave-display-available.o
../octave/liboctave/wrappers/uniconv-wrappers.c:32:21: fatal error: 
uniconv.h: No such file or directory
 #include "uniconv.h"
                     ^
compilation terminated.
  CXX      src/src_octave-main.o
  CXX      src/src_octave_cli-octave-build-info.o
  CXX      src/src_octave_config-octave-config.o
make[2]: *** 
[liboctave/wrappers/liboctave_wrappers_libwrappers_la-uniconv-wrappers.lo] 
Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/home/tomdean/Math/Octave/octave-build'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/tomdean/Math/Octave/octave-build'
make: *** [all] Error 2

Tom Dean