lemonflex: fix warning: no previous prototype for 'df_scanner_*' [-Wmissing-prototypes]
lemonflex-tail.inc:44:1: warning: no previous prototype for 'df_scanner_text' [-Wmissing-prototypes]
lemonflex-tail.inc:50:1: warning: no previous prototype for 'df_scanner_file' [-Wmissing-prototypes]
lemonflex-tail.inc:59:1: warning: no previous prototype for 'df_scanner_cleanup' [-Wmissing-prototypes]
Change-Id: If0476b430592df225234c5c685c8009ab08b5ab6
Reviewed-on: https://code.wireshark.org/review/10162
Reviewed-by: Anders Broman <a.broman58@gmail.com>