Fix linker problem

This fixes the linker problem:

/usr/bin/ld: error: ../../libraries/shared/libshared.a(StreamUtils.cpp.o): multiple
definition of 'operator<<(std::ostream&, glm::detail::tvec3<float, (glm::precision)0> const&)'
/usr/bin/ld: CMakeFiles/physics-tests.dir/src/PhysicsTestUtil.cpp.o: previous definition here
/usr/bin/ld: error: ../../libraries/shared/libshared.a(StreamUtils.cpp.o): multiple
definition of 'operator<<(std::ostream&, glm::detail::tquat<float, (glm::precision)0> const&)'
/usr/bin/ld: CMakeFiles/physics-tests.dir/src/PhysicsTestUtil.cpp.o: previous definition here
/usr/bin/ld: error: ../../libraries/shared/libshared.a(StreamUtils.cpp.o): multiple
definition of 'operator<<(std::ostream&, glm::detail::tmat4x4<float, (glm::precision)0> const&)'
/usr/bin/ld: CMakeFiles/physics-tests.dir/src/PhysicsTestUtil.cpp.o: previous definition here
collect2: error: ld returned 1 exit status

Note these are the serializers to std::ostream that were already there, not the ones
that I added (which are to QDebug). This bug was already there, I only got these errors
now after adding some debug code.

The reason is obvious: they are already defined in libshared.a (through StreamUtils.cpp).
No need to define them again in ./tests/physics/src/PhysicsTestUtil.cpp