Ravi Prakash d8699afe20 [example] Eliminate warning when building helloworld. (#32884) ...

Without this change, new users get this warning:
```
CMake Warning (dev) at $MY_INSTALL_DIR/lib64/cmake/protobuf/protobuf-options.cmake:6 (option):
  Policy CMP0077 is not set: option() honors normal variables.  Run "cmake
  --help-policy CMP0077" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

  For compatibility with older versions of CMake, option is clearing the
  normal variable 'protobuf_MODULE_COMPATIBLE'.
Call Stack (most recent call first):
  $MY_INSTALL_DIR/lib64/cmake/protobuf/protobuf-config.cmake:2 (include)
  $MY_SRC_PATH/examples/cpp/cmake/common.cmake:99 (find_package)
  CMakeLists.txt:24 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.
```

release notes: no


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2023-05-02 13:01:07 -07:00

..

common.cmake

[example] Eliminate warning when building helloworld. (#32884)

2023-05-02 13:01:07 -07:00