Add `OUTPUT_STRIP_TRAILING_WHITESPACE` option to `execute_process` command. Latest CMake (tested 3.18.1) doesn't strip new line from `protoc --version` call, which leads to wrong `PROTOC_VERSION` variable and failure on git fetch step.
Add `OUTPUT_STRIP_TRAILING_WHITESPACE` option to `execute_process` command. Latest CMake (tested 3.18.1) doesn't strip new line from `protoc --version` call, which leads to wrong `PROTOC_VERSION` variable and failure on git fetch step.