Force gzip to overwrite an existing changelog (#665)

If a compressed changelog exists from a previous build, reconfiguring
the project fails with
```
[rocm-core configure] CMake Error at utils.cmake:213 (message):
[rocm-core configure]   Failed to compress: gzip:
[rocm-core configure]   /home/ben/src/TheRock/build/base/rocm-core/build/DEBIAN/changelog.Debian.gz
[rocm-core configure]   already exists; not overwritten
```

Add `-f` to force overwriting.

projects/rocm-core/utils.cmake

@@ -229,7 +229,7 @@ function( configure_debian_pkg PACKAGE_NAME_T COMPONENT_NAME_T PACKAGE_VERSION_T
       find_program ( DEB_GZIP_EXEC gzip )
       if(EXISTS "${CMAKE_BINARY_DIR}/DEBIAN/changelog.Debian" )
         execute_process(
-          COMMAND ${DEB_GZIP_EXEC} -n -9 "${CMAKE_BINARY_DIR}/DEBIAN/changelog.Debian"
+          COMMAND ${DEB_GZIP_EXEC} -f -n -9 "${CMAKE_BINARY_DIR}/DEBIAN/changelog.Debian"
           WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/DEBIAN"
           RESULT_VARIABLE result
           OUTPUT_VARIABLE output