Standalone mode CMP0177 requires newer cmake

[swanemar]

Hey,

Running -DSTANDALONE_MODE=ON seem to require CMP0177 policy from cmake introduced in v3.31. Current requirement is set to 3.23 in CMakeLists.txt

https://cmake.org/cmake/help/v3.31/policy/CMP0177.html

$cmake -B build -DSTANDALONE_MODE=ON
-- Detecting LTO
-- Detecting LTO - Supported
-- Detecting PIE/PIC
-- Detecting PIE/PIC - Supported
CMake Error at CMakeLists.txt:64 (cmake_policy):
  Policy "CMP0177" is not known to this version of CMake.

$cmake --version
cmake version 3.28.