breakage with ioctl.c. The .depend file should track dependencies
just fine, and the worst we can have is to miss new ioctls.
But I still think it's a good idea to have -DNOCLEAN build produce
the same ioctl.c as it would without -DNOCLEAN.
Prodded for a long time by: bde
since it could potentially depend on any ${DESTDIR}/usr/include
preprocessor file. This fixes the broken -DNOCLEAN world build
I experienced yesterday.
now be specified on the command line. Accept a '-s' option which
controls whether a switch-statement is to be used instead of a series
of if-statements.
Replace cpp with gcc -E.
Discussed with: bde
