Enhance the buildconf script

Changes:
- Added a short introduction what this script does
- Added usually the expected -h and --help options with explanation
  for a reason for this script and its usage.
- Messages changed a bit so the PHP installation procedure becomes
  simpler without needing to constantly remind the reader what to run
  and what not in the documentations and installation instructions.
- cd into current working directory of the buildconf (this enables
  running the script from other locations and inside other scripts).
- check if make exists

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