[T] Use OGS' internal behaviour library.

Dropped old libBehaviour.so.

Tests/Data/Mechanics/Linear/MFront/axisymm_ring/ring_plane_strain.prj

@@ -9,7 +9,6 @@
             <integration_order>2</integration_order>
             <constitutive_relation>
                 <type>MFront</type>
-                <library>../disc_with_hole/libBehaviour.so</library>
                 <behaviour>Elasticity</behaviour>
                 <material_properties>
                     <material_property name="YoungModulus" parameter="E"/>

Tests/Data/Mechanics/Linear/MFront/disc_with_hole/disc_with_hole.prj

@@ -9,7 +9,6 @@
             <integration_order>2</integration_order>
             <constitutive_relation>
                 <type>MFront</type>
-                <library>libBehaviour.so</library>
                 <behaviour>Elasticity</behaviour>
                 <material_properties>
                     <material_property name="YoungModulus" parameter="E"/>