tcpflow: add -devel subport; remove useless dependency from python27

[catap]

Description

Well, without python27 ./configure complains:

  *** Cannot find python library.
  *** Please install python-devel to enable scanner python.
  ...
  configure: *** You have missing libraries. To install them:
  configure: *** Red Hat: sudo yum install  python-devel  python-devel
  configure: *** Fedora:  sudo dnf install  python-devel  python-devel
  configure: *** Ubuntu:  sudo apt-get install  libpython2.7-dev libpython2.7-dev
  configure: *** MacOS:   sudo port install  python27 python27

but since version 1.6.1 tcpflow doesn't require nor use python anymore because the only plugin which is used it (scan_python.cpp) was excluded from build.

See:

• https://github.com/simsong/tcpflow/blob/tcpflow-1.6.1/src/scan_python.cpp
• Remove misslead requirement for python-2.7 simsong/tcpflow#254

Anyway, future release may bring that plugin back.

Type(s)

• bugfix
• enhancement

Tested on

macOS 12.6.8 21G725 x86_64
Xcode 14.2 14C18

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• checked your Portfile with port lint --nitpick?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?