Problem with "make distclean" and dependencies

[Michael Goffioul]

When I do a "make distclean", I get the following error in src/ directory:

make[2]: Entering directory `/c/Sources/playground/c/octave-hg/build-msvc/src'
make -C ../liboctave ../liboctave/DASPK-opts.h
make[3]: Entering directory
`/c/Sources/playground/c/octave-hg/build-msvc/liboctave'
make[3]: *** No rule to make target `../liboctave/DASPK-opts.h'.  Stop.

I think it's due to the fact that in src/Makefile.in, $(MAKEDEPS)
depends on $(OPT_INC) and when make tries to rebuild
../liboctave/DASPK-opts.h, the Makefile has already been removed
in liboctave/ directory.

Michael.