More php3_ annihilation

- Made PHP_VERSION and PHP_OS work again
- More php3_ cleanup
@- Restored the PHP_VERSION and PHP_OS constants (Zeev)

Clean up php3.*\.h files. The files itself are renamed, and references in all
.*\.[ch] files were changed. There is a slight chance that my script missed
a few changes, please correct them ma

Clean up php3.*\.h files. The files itself are renamed, and references in all
.*\.[ch] files were changed. There is a slight chance that my script missed
a few changes, please correct them manually.

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