Merge pull request #703 from bilke/catalyst-compiler

Updated ThirdParty/vtkdiff submodule and pass compiler to Catalyst build

vtkdiff @ 0adfc286

-Subproject commit d8af1935bc8577c6d2accb2c828524ead107630b
+Subproject commit 0adfc286138d9046c4b5d7ee34054877d57af3fe

scripts/cmake/ExternalProjectCatalyst.cmake

@@ -102,7 +102,8 @@ endif()
 ExternalProject_Add(Catalyst
 	PREFIX ${CMAKE_BINARY_DIR}/External/catalyst
 	GIT_REPOSITORY ${CATALYST_GIT_URL}
-	CONFIGURE_COMMAND ../Catalyst/${CATALYST_CONFIGURE_COMMAND} -G ${CATALYST_CMAKE_GENERATOR} ../Catalyst
+	CONFIGURE_COMMAND ../Catalyst/${CATALYST_CONFIGURE_COMMAND} -G ${CATALYST_CMAKE_GENERATOR}
+		-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER} -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER} ../Catalyst
 	BUILD_COMMAND ${CATALYST_MAKE_COMMAND}
 	INSTALL_COMMAND ""
 )