app, tools: various fixes for Win32 build.
* Type pid_t is not cross-platform. Just use int instead, and convert it to respective type on each platform. * Get rid of several useless include which should have been removed a few commits ago, when I reimplemented the backtrace function. * Better handle the various macros in gimp_eek() (between G_OS_WIN32, HAVE_EXCHNDL and GIMP_CONSOLE_COMPILATION, but also no_interface and generate_backtrace options, that was a bit messy). * Make gimpdebug now always built, whatever the platform.
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