Fix UUID not found compilation error on openeuler

[wwstory]

Describe the bug
CMake fails to find UUID library when building drogon on openEuler 22.03, resulting in compilation error "Could not find UUID". The UUID library (libuuid-devel) is already installed on the system, but CMake still cannot locate it during configuration.

To Reproduce
Steps to reproduce the behavior:

1. docker run --name euler22 -it openeuler/openeuler:22.03-lts bash
2. Install UUID development library: sudo yum install libuuid-devel
3. Verify installation: rpm -qa | grep uuid shows libuuid-devel is installed
4. Clone the drogon repository
5. Create build directory: mkdir build && cd build
6. Run CMake configuration: cmake ..

Expected behavior
cmake should successfully find the installed UUID library and complete configuration without errors.

Screenshots

Error output
CMake Error at /data/chengzi/jingjing/third_party/drogon/cmake_modules/FindUUID.cmake:98 (message):
Could not find UUID
Call Stack (most recent call first):
/data/chengzi/jingjing/third_party/drogon/CMakeLists.txt:224 (find_package)

[an-tao]

@wwstory Thanks for your patch, but changes to Changelog.md are unnecessary, please rebase to the latest version.