$NetBSD$

Use CONFIG method of finding external Angelscript library.

--- CMakeLists.txt.orig	2023-01-18 20:50:11.059525955 -0800
+++ CMakeLists.txt	2023-01-18 21:19:31.093020651 -0800
@@ -402,19 +402,13 @@
 
 # Build the angelscript library if not in system
 if(USE_SYSTEM_ANGELSCRIPT)
-    find_package(Angelscript)
-    if(ANGELSCRIPT_FOUND)
+    find_package(Angelscript CONFIG REQUIRED)
         include_directories(${Angelscript_INCLUDE_DIRS})
-    else()
-        message(FATAL_ERROR "Angelscript not found. "
-            "Either install angelscript or use built-in version using "
-            "-DUSE_SYSTEM_ANGELSCRIPT=0")
-    endif()
 else()
     add_subdirectory("${PROJECT_SOURCE_DIR}/lib/angelscript/projects/cmake")
     include_directories(BEFORE "${PROJECT_SOURCE_DIR}/lib/angelscript/include")
-    set(Angelscript_LIBRARIES angelscript)
 endif()
+set(Angelscript_LIBRARIES angelscript)
 
 if(NOT SERVER_ONLY)
     # OpenAL
