CMake: Bump minimum version to 3.17.

CPack's External generator was already a 3.13 feature.

3.17 is picked for CMP0099 by default.

The version is set as a range, so hopefully we have a decade or two before the next deprecation warning.

Author: FtZPetruska

.github/workflows/continuous_integration.yml

@@ -29,7 +29,6 @@ jobs:
               -A x64
               -DCMAKE_TOOLCHAIN_FILE="${env:VCPKG_INSTALLATION_ROOT}\scripts\buildsystems\vcpkg.cmake"
               -DVCPKG_TARGET_TRIPLET=x64-windows-static-release
-              -DCMAKE_POLICY_DEFAULT_CMP0091=NEW
               -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded
               -DCMAKE_IGNORE_PATH="C:/Strawberry/perl/bin;C:/Strawberry/c/lib"
 

prboom2/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.17...4.0)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 
@@ -18,20 +18,10 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
     "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
 endif()
 
-if(POLICY CMP0099)
-  cmake_policy(SET CMP0099 NEW)
-else()
-  message(WARNING "Your version of CMake is very old. This may cause linking issues if your dependencies are not in your compiler's default search paths.")
-endif()
-
 if(VCPKG_TOOLCHAIN)
     set(ENV{PKG_CONFIG_PATH} "${VCPKG_INSTALLED_DIR}/${VCPKG_TARGET_TRIPLET}/lib/pkgconfig")
 endif()
 
-if(POLICY CMP0069)
-    cmake_policy(SET CMP0069 NEW)
-endif()
-
 set(PROJECT_TARNAME "dsda-doom")
 set(WAD_DATA "dsda-doom.wad")
 set(PROJECT_STRING "${PROJECT_NAME} ${PROJECT_VERSION}")