message: Fix amalgamation build
diff: @@ -137,7 +137,7 @@ def generate_amalgamation(source_file, header_file):
  # now construct duckdb.cpp
  print("------------------------")
  - print("-- Writing " + source_file " --")
  + print("-- Writing " + source_file + " --")
  print("------------------------")
  # scan all the .cpp files
  