fix: scope CMAKE_POLICY_DEFAULT_CMP0091 to each FetchContent

Author: hypernewbie

CMakeLists.txt

@@ -7,7 +7,6 @@ endif()
 project(VEFontCache LANGUAGES C CXX)
 
 set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded")
-set(CMAKE_POLICY_DEFAULT_CMP0091 NEW)
 
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -35,17 +34,21 @@ if(VEFC_ENABLE_FREETYPE)
     if(POLICY CMP0077)
         cmake_policy(SET CMP0077 NEW)
     endif()
+    set(CMAKE_POLICY_DEFAULT_CMP0091 NEW)
     FetchContent_MakeAvailable(freetype)
+    unset(CMAKE_POLICY_DEFAULT_CMP0091)
 endif()
 
 if(VEFC_ENABLE_HARFBUZZ)
+    set(CMAKE_POLICY_DEFAULT_CMP0091 NEW)
     FetchContent_Declare(
         harfbuzz
         GIT_REPOSITORY https://github.com/harfbuzz/harfbuzz.git
         GIT_TAG 11.2.1
     )
     set(HB_BUILD_SUBSET OFF CACHE BOOL "" FORCE)
     FetchContent_MakeAvailable(harfbuzz)
+    unset(CMAKE_POLICY_DEFAULT_CMP0091)
 endif()
 
 if(VEFC_BUILD_DEMO OR VEFC_BUILD_VRHI)