Update p4dctl to build with 2008.2 API.
No major changes needed,
mostly jam stuff. The big change is to include all the rules from
the sample Jamrules included in the Perforce API since that's the
Jamrules used to build the API. This ensures that we're using the
right compiler/linker flags on every platform.
I also made sure that when lex & yacc are installed, and the
grammar is compiled as part of the build, that the source tree
is updated with the pre-compiled grammar. Makes it easy to
maintain.