Allowed includes to use an include path.
Added the "-I" (include path) and -D (define variable) command line options.
Fixed bug causing parser to occasionally miss $var variable expansions,
usually resulting in "unexpected end of file" errors.
Made Makefile.linux slightly more flexible.
Converted 3rd paramater in accept() calls to size_t, as it should be (which
really doesn't affect grunt, but does allow me to compile on all of my linux
systems).
Took out troublesome inclusion of _G_confi.h from gnulib/std.h 0.12