[General] Remove CallFF find module

cmake/FindCallFF.cmake

@@ -1,27 +0,0 @@
-FIND_PATH(CallFF_INCLUDES call.hpp
-        ENV CPATH
-        /usr/include
-        /usr/local/include
-        /opt/local/include
-        $ENV{CallFF_ROOT}/include
-        )
-
-FIND_LIBRARY(CallFF_LIBRARY NAMES callff
-        PATHS
-        ENV LD_LIBRARY_PATH
-        ENV LIBRARY_PATH
-        /usr/lib64
-        /usr/lib
-        /usr/local/lib64
-        /usr/local/lib
-        /opt/local/lib
-        $ENV{CallFF_ROOT}/lib
-        )
-
-if(CallFF_LIBRARY)
-    set(CallFF_LIBRARIES "${CallFF_LIBRARY}" CACHE STRING "CallFF Libraries")
-endif()
-
-if(CallFF_INCLUDES AND CallFF_LIBRARY)
-    set(CallFF_FOUND TRUE)
-endif(CallFF_INCLUDES AND CallFF_LIBRARY)