cmake: fix assimp lib

Assimp seems to not be well packaged :(

src/CMakeLists.txt

@@ -156,12 +156,14 @@ add_library(${LIBRARY_NAME}
 ADD_SOURCE_GROUP(${LIBRARY_NAME}_SOURCES)
 ADD_HEADER_GROUP(PROJECT_HEADERS_FULL_PATH)
 
+FIND_LIBRARY(ASSIMP_FULL_LIB NAMES assimp PATHS ${ASSIMP_LIBRARY_DIRS} NO_DEFAULT_PATH)
+
 TARGET_LINK_LIBRARIES(${LIBRARY_NAME}
   PUBLIC
   ${Boost_THREAD_LIBRARY}
   ${Boost_DATE_TIME_LIBRARY}
   ${Boost_SYSTEM_LIBRARY}
-  ${ASSIMP_LIBRARY_DIRS}/${ASSIMP_LIBRARIES}
+  ${ASSIMP_FULL_LIB}
 #  assimp::assimp # Not working
 #  Boost::thread
 #  Boost::date_time