fix memory functions: define memory functions
fix memory functions: define memory functions

In commit 839a29f0 three new functions were added. However, the
functions weren't defined on the PHP level. Fix this.

Signed-off-by: Vasiliy Tolstov <c36af997645181f727020b1671b7c66b7a9c7a34@selfip.ru>

libvirt/libvirt-php,tucksaun/libvirt-php,tucksaun/libvirt-php,zippy2/libvirt-php,libvirt/libvirt-php,zippy2/libvirt-php,zippy2/libvirt-php,vtolstov/libvirt-php,libvirt/libvirt-php,vtolstov/libvirt-php,vtolstov/libvirt-php,vtolstov/libvirt-php,tucksaun/libvirt-php,tucksaun/libvirt-php