don't add geo related tests if libgeos is not installed. This fixes a problem that appeared for some (older) CMake version on Windows.
don't add geo related tests if libgeos is not installed. This fixes a problem that appeared for some (older) CMake version on Windows.

cezarfx/zorba,cezarfx/zorba,28msec/zorba,cezarfx/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,cezarfx/zorba,28msec/zorba,28msec/zorba,bgarrels/zorba,28msec/zorba,28msec/zorba,cezarfx/zorba,cezarfx/zorba,cezarfx/zorba,bgarrels/zorba,28msec/zorba,bgarrels/zorba,28msec/zorba,cezarfx/zorba,28msec/zorba,bgarrels/zorba,bgarrels/zorba,bgarrels/zorba,28msec/zorba,bgarrels/zorba