Dependency tracking

[Thomas 'Tom' R. Treadway III]

I would like to have the option of making dependency tracking default 
to "no-dependencies",
unless a --enable-dependency-tracking configuration option is used. 
Much like how
how AC_DISABLE_SHARED works to decrease compile time.

   trt
--
Thomas R. Treadway
Computer Scientist
Lawrence Livermore Nat'l Lab
7000 East Avenue, L-365
Livermore, CA 94550-0611