message: configure: disable gnu statement warnings
diff: -#!/usr/bin/env python
  +#!/usr/bin/env python2
  #-*- mode: python; -*-
  from support.config import ConfigBuilder, slurp, exe_available
  from os import environ, curdir, listdir
  @@ -45,6 +45,7 @@ c.append('cflags', '-D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700')
  c.append('cflags', '-Wall -Wextra -pedantic')
  c.append('cflags', '-Wundef')
  +c.append('cflags', '-Wno-gnu-statement-expression')
  c.append('cflags', '-Wno-unused-parameter')
  c.append('cflags', '-Wno-unused-variable')
  c.append('cflags', '-Wno-c99-extensions')
  