Introduce AC_ADD_* macros

The use of AC_EXPAND_PATH makes it possible to continue
to use relative paths when configuring PHP.
(e.g. --with-apache=../apache-1.3.x works again)

last bunch of extensions moving to ext/
fhttpd module taken out of functions, functions is ready to go.
The only extensions I have tested are gd+freetype and odbc(solid).
Please try compi

last bunch of extensions moving to ext/
fhttpd module taken out of functions, functions is ready to go.
The only extensions I have tested are gd+freetype and odbc(solid).
Please try compiling in your favourite extensions and let me know how it
works.

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