More fun with Boost serialization

Don't even bother trying to create a target if
!TTG_PARSEC_USE_BOOST_SERIALIZATION

Signed-off-by: Joseph Schuchart <joseph.schuchart@stonybrook.edu>

Author: devreal

ttg/CMakeLists.txt

@@ -171,7 +171,7 @@ if (TARGET MADworld)
   list(APPEND ttg-serialization-deps MADworld)
   list(APPEND ttg-serialization-compile-definitions TTG_SERIALIZATION_SUPPORTS_MADNESS=1)
 endif(TARGET MADworld)
-if (TARGET Boost::serialization)
+if (TTG_PARSEC_USE_BOOST_SERIALIZATION AND TARGET Boost::serialization)
   list(APPEND ttg-serialization-deps Boost::serialization)
   list(APPEND ttg-serialization-boost-deps Boost::serialization)
   if (TARGET Boost::iostreams)  # using modularized Boost?
@@ -195,13 +195,13 @@ if (TARGET MADworld)
           COMPILE_DEFINITIONS "TTG_SERIALIZATION_SUPPORTS_MADNESS=1")
 endif(TARGET MADworld)
 # make boost-only serialization target
-if (TARGET Boost::serialization)
+if (TTG_PARSEC_USE_BOOST_SERIALIZATION AND TARGET Boost::serialization)
   add_ttg_library(ttg-serialization-boost
           "${ttg-serialization-sources}"
           PUBLIC_HEADER "${ttg-serialization-headers}"
           LINK_LIBRARIES "${ttg-serialization-boost-deps}"
           COMPILE_DEFINITIONS "TTG_SERIALIZATION_SUPPORTS_BOOST=1")
-endif(TARGET Boost::serialization)
+endif(TTG_PARSEC_USE_BOOST_SERIALIZATION AND TARGET Boost::serialization)
 
 #########################
 ####### MADNESS-specific