message: ispc target list already considers the multi-isa issue
diff: @@ -90,12 +90,7 @@ ENDMACRO ()
  MACRO (OSPRAY_ISPC_COMPILE)
  SET(ISPC_ADDITIONAL_ARGS "")
  - # iw: adding 'sse2' here forces ispc to generate multi-isa binaries
  - # even if we "want" only a single one - this is required because
  - # embree is compiled with multi-isa, and if we use a single-isa
  - # we'll get function symbols that are differently mangled than the
  - # one in embree, so will get link errors...
  - SET(ISPC_TARGETS sse2;${OSPRAY_ISPC_TARGET_LIST})
  + SET(ISPC_TARGETS ${OSPRAY_ISPC_TARGET_LIST})
  SET(ISPC_TARGET_EXT ${CMAKE_CXX_OUTPUT_EXTENSION})
  STRING(REPLACE ";" "," ISPC_TARGET_ARGS "${ISPC_TARGETS}")
  