Fixes #66764 - configure doesn't define EXPANDED_DATADIR / PHP_DATADIR correctly #975
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as the bugreport explains the value for EXPANDED_DATADIR doesn't gets properly expanded.
it is borked since 5.4 when we moved from autoconf 2.13 to 2.59: http://3v4l.org/IpcgT
the reason is that there are some autoconf default values which were changed in autoconf 2.59c(http://lists.gnu.org/archive/html/automake/2006-04/msg00065.html) and datadir is now defaults to '$datarootdir' which in turn defaults to '${prefix}/share'
previously(before autoconf 2.59 so up to php 5.3 there was no datarootdir and datadir was defaulting to '${prefix}/share' so a single eval was enough to expand the path.