Instead of pinning Darwin to older versions, add small patches to
configure.in (7.1) / configure.ac (7.2) to fix the build of the intl
extension on recent PHP versions on Darwin.
fix-paths-php7.patch also required changes -- since we now run autoconf
at build time (through ./buildconf), it needs to patch the input .m4
files instead of ./configure directly.
The first beta of php7 has been released. This enables developers to
test their code for breakage in preparation for the stable release and
allows us to make sure we don't have any bugs in the packaging prior to
the stable release.