Add Draco to cmakelists

Initial pass. Not yet used.
Add Draco library to assimp build and link

code/CMakeLists.txt

@@ -1117,6 +1117,11 @@ IF (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
   INCLUDE_DIRECTORIES(${C4D_INCLUDES})
 ENDIF ()
 
+IF (ASSIMP_BUILD_DRACO)
+  INCLUDE_DIRECTORIES(${draco_INCLUDE_DIRS})
+  ADD_DEFINITIONS( -DASSIMP_ENABLE_DRACO )
+ENDIF()
+
 ADD_LIBRARY( assimp ${assimp_src} )
 ADD_LIBRARY(assimp::assimp ALIAS assimp)
 
@@ -1149,7 +1154,7 @@ IF(ASSIMP_HUNTER_ENABLED)
       pugixml
   )
 ELSE()
-  TARGET_LINK_LIBRARIES(assimp ${ZLIB_LIBRARIES} ${OPENDDL_PARSER_LIBRARIES} )
+  TARGET_LINK_LIBRARIES(assimp ${ZLIB_LIBRARIES} ${OPENDDL_PARSER_LIBRARIES})
 ENDIF()
 
 if(ASSIMP_ANDROID_JNIIOSYSTEM)
@@ -1164,6 +1169,10 @@ IF (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
   TARGET_LINK_LIBRARIES(assimp ${C4D_EXTRA_LIBRARIES})
 ENDIF ()
 
+IF (ASSIMP_BUILD_DRACO)
+  target_link_libraries(assimp draco)
+ENDIF()
+
 if( MSVC )
   # in order to prevent DLL hell, each of the DLLs have to be suffixed with the major version and msvc prefix
   # CMake 3.12 added a variable for this