Force PECL to install 64bit modules

To ensure PECL installs 64bit modules you need to install the 64bit php-devel package.

On a RHEL system perform the following:

1. pecl uninstall
2. yum remove php-devel.i386
3. yum install php-devel.x86_64
4. pecl install

Any further modules will now be 64bit.