fix srt cmake 4.x compiling error. v7.0.52

[suzp1984]

How to reproduce?

1. cmake version 4.0.3
2. clean srt build cache:
   rm -rf objs/Platform-*
3. ./configure

compiling error output:

Build srt-1-fit
patching file './objs/Platform-SRS7-Darwin-24.6.0-Clang17.0.0-arm64/srt-1-fit/srtcore/api.cpp'
Running: cmake . -DCMAKE_INSTALL_PREFIX=/Users/jacobsu/hack/media/srs/trunk/objs/Platform-SRS7-Darwin-24.6.0-Clang17.0.0-arm64/3rdparty/srt -DENABLE_APPS=0 -DENABLE_STATIC=1 -DENABLE_CXX11=0 -DENABLE_SHARED=0 -DOPENSSL_INCLUDE_DIR=/usr/local/opt/openssl/include -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib/libcrypto.a
CMake Error at CMakeLists.txt:10 (cmake_minimum_required):
Compatibility with CMake < 3.5 has been removed from CMake.

Update the VERSION argument value. Or, use the ... syntax
to tell CMake that the project requires at least but has been updated
to work with policies introduced by or earlier.

Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

-- Configuring incomplete, errors occurred!

Cause

CMake 4.x not long compatible with function cmake_minimum_required (VERSION 2.8.12 FATAL_ERROR) with only min version anymore.

Solution

add add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to cmake cmd args.

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Co-authored-by: Haibo Chen 495810242@qq.com

[duiniuluantanqin]

CMake 4 is indeed not backward-compatible.