util: alloc: Reimplement VIR_APPEND_ELEMENT_(COPY_)INPLACE using virAppendElement
util: alloc: Reimplement VIR_APPEND_ELEMENT_(COPY_)INPLACE using virAppendElement

VIR_APPEND_ELEMENT_INPLACE and VIR_APPEND_ELEMENT_COPY_INPLACE already
ignore the return value from 'virInsertElementsN' which allows a trivial
conversion to virAppendElement without the need for 'ignore_value'.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

crobinso/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,jfehlig/libvirt,nertpinx/libvirt,olafhering/libvirt,crobinso/libvirt,zippy2/libvirt,crobinso/libvirt,olafhering/libvirt,zippy2/libvirt,nertpinx/libvirt,jfehlig/libvirt,nertpinx/libvirt,libvirt/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,jfehlig/libvirt,crobinso/libvirt,libvirt/libvirt,jfehlig/libvirt,olafhering/libvirt