Remove CMake code once Axom and BLT are updated

[ldowen]

The code CMake code for bringing in Axom should be unnecessary in future updates. Specifically:

spheral/cmake/InstallTPLs.cmake

Lines 85 to 89 in ab7c4bc

	foreach(_comp ${AXOM_COMPONENTS_ENABLED})
	list(APPEND SPHERAL_BLT_DEPENDS axom::${_comp})
	get_target_property(axom_deps axom::${_comp} INTERFACE_LINK_LIBRARIES)
	list(APPEND SPHERAL_BLT_DEPENDS ${axom_deps})
	endforeach()

and

spheral/cmake/InstallTPLs.cmake

Lines 112 to 131 in ab7c4bc

	set(_props)
	if( ${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.13.0" )
	list(APPEND _props INTERFACE_LINK_OPTIONS)
	endif()
	list(APPEND _props INTERFACE_COMPILE_OPTIONS)
	foreach(_target axom axom::openmp)
	if(TARGET ${_target})
	message(STATUS "Removing OpenMP Flags from target[${_target}]")
	foreach(_prop ${_props})
	get_target_property(_flags ${_target} ${_prop})
	if ( _flags )
	string( REPLACE "${OpenMP_CXX_FLAGS}" ""
	correct_flags "${_flags}" )
	string( REPLACE "${OpenMP_Fortran_FLAGS}" ""
	correct_flags "${correct_flags}" )
	set_target_properties( ${_target} PROPERTIES ${_prop} "${correct_flags}" )
	endif()
	endforeach()
	endif()
	endforeach()