message: Fix unsafe package version number
diff: @@ -23,7 +23,7 @@ if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git)
  endif()
  if(UNSAFE_VERSION)
  - set(CCF_VERSION "${CCF_VERSION}_unsafe")
  + set(CCF_VERSION "${CCF_VERSION}+unsafe")
  endif()
  # Convert git description into cmake list, separated at '-'
  @@ -47,7 +47,7 @@ else()
  )
  if(UNSAFE_VERSION)
  - set(CCF_VERSION "${CCF_VERSION}_unsafe")
  + set(CCF_VERSION "${CCF_VERSION}+unsafe")
  endif()
  # Convert directory name into cmake list, separated at '-'
  