Some PECL modules (possibly also php modules) depend on
special load order, otherwise loading the module will fail
due to unresolvable symbols.

This changeset introduces a very simple compile-time defined
order by specifying a prefix for the ini file with the load
directive. If not given, it uses a default value.

It also updates all current pecl module packages to take
this new approach.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

This is a copy of the existing php5 stuff, adopted for PHP7.

Please not, that its not supported to install both php5
and php7 in parallel on the target.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

This allows pecl modules to rely on PKG_FIXUP:=autoreconf.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

Signed-off-by: W. Michael Petullo <mike@flyn.org>