use cmake imported target for openal

Author: zerotacg

nel/src/sound/driver/openal/CMakeLists.txt

@@ -29,7 +29,6 @@ NL_TARGET_DRIVER(${NLDRV_AL_LIB} ${SRC})
 IF(HUNTER_ENABLED)
   HUNTER_ADD_PACKAGE(OpenAL)
   FIND_PACKAGE(OpenAL CONFIG REQUIRED)
-  SET(OPENAL_LIBRARY OpenAL::OpenAL)
   TARGET_COMPILE_DEFINITIONS(${NLDRV_AL_LIB} PRIVATE AL_LIBTYPE_STATIC)
 ELSE()
   TARGET_INCLUDE_DIRECTORIES(${NLDRV_AL_LIB}
@@ -38,7 +37,7 @@ ELSE()
   )
 ENDIF()# hunter
 
-TARGET_LINK_LIBRARIES(${NLDRV_AL_LIB} nelmisc nelsnd_lowlevel ${OPENAL_LIBRARY})
+TARGET_LINK_LIBRARIES(${NLDRV_AL_LIB} nelmisc nelsnd_lowlevel OpenAL::OpenAL)
 NL_DEFAULT_PROPS(${NLDRV_AL_LIB} "NeL, Driver, Sound: OpenAL")
 NL_ADD_RUNTIME_FLAGS(${NLDRV_AL_LIB})
 NL_ADD_LIB_SUFFIX(${NLDRV_AL_LIB})