* strace.cc: Use specific cygwin includes, as required.
(load_cygwin): New function. Loads cygwin DLL, if necessary.
(attach_process): Attaches strace to a running process.
(dostrace): Accept pid argument. Attach to pid if supplied.
(usage): Describe -p option. Correct system description.
(longopts): Alphabetize.
(opts): Ditto.
(main): Ditto. Handle -p option.
* Makefile.in (CXXFLAGS): Ensure that important settings are preserved even
when overriden by command line.
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