Mantaflow: Address precompiler warning and related cleanup

* Address warning because of undefined OPENVDB usage
* Remove unused WITH_FLUID definitions

Differential Revision: https://developer.blender.org/D6919

intern/mantaflow/CMakeLists.txt

@@ -28,6 +28,8 @@ add_definitions(-DWITH_FLUID=1)
 if(WITH_OPENVDB)
   add_definitions(-DOPENVDB=1)
   add_definitions(-DOPENVDB_STATICLIB)
+else()
+  add_definitions(-DOPENVDB=0)
 endif()
 
 if(WIN32)

source/blender/editors/space_view3d/CMakeLists.txt

@@ -94,10 +94,6 @@ if(WITH_FREESTYLE)
   add_definitions(-DWITH_FREESTYLE)
 endif()
 
-if(WITH_MOD_FLUID)
-  add_definitions(-DWITH_FLUID)
-endif()
-
 blender_add_lib(bf_editor_space_view3d "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
 
 # Needed so we can use dna_type_offsets.h for defaults initialization.

source/blender/render/CMakeLists.txt

@@ -86,10 +86,6 @@ if(WITH_IMAGE_OPENEXR)
   add_definitions(-DWITH_OPENEXR)
 endif()
 
-if(WITH_MOD_FLUID)
-  add_definitions(-DWITH_FLUID)
-endif()
-
 if(WITH_FREESTYLE)
   list(APPEND INC
     ../freestyle