Scope GRPC/ODB/OpenVDS/HDF5 build flags to avoid full rebuilds

- Remove unused SOURCE_GROUP_HEADER_FILES from GrpcInterface CMakeLists
- Scope the following defines to the files that need it ENABLE_GRPC, USE_ODB_API , USE_OPENVDS, USE_HDF5 
- RifOdbReader.cpp copied an odb_InstanceRepository by value, which
  fails to compile under MSVC's strict conformance mode due to an
  ambiguous implicit copy constructor in the vendor headers (diamond
  inheritance). Use a reference instead, since it was only ever read
  from.

ApplicationExeCode/CMakeLists.txt

@@ -210,17 +210,19 @@ set(LINK_LIBRARIES
 
 if(RESINSIGHT_ENABLE_GRPC)
   list(APPEND LINK_LIBRARIES GrpcInterface)
+
+  # Scope to the one file that needs it, to avoid a full rebuild on toggle.
+  set_source_files_properties(
+    ${CMAKE_CURRENT_SOURCE_DIR}/RiaMain.cpp PROPERTIES COMPILE_DEFINITIONS
+                                                       ENABLE_GRPC
+  )
 endif()
 
 if(RESINSIGHT_USE_ODB_API)
-  add_definitions(-DUSE_ODB_API)
+  target_compile_definitions(ResInsight PRIVATE USE_ODB_API)
   list(APPEND LINK_LIBRARIES RifOdbReader)
 endif()
 
-if(RESINSIGHT_ENABLE_OPENVDS)
-  add_definitions(-DUSE_OPENVDS)
-endif()
-
 target_link_libraries(ResInsight PRIVATE ${LINK_LIBRARIES})
 
 if(UNIX AND NOT APPLE)