Merge branch 'release-0.6.7'

* release-0.6.7:
  plugins: add a comment to clarify strange behaviour
  txtinfo: set_plugin_boolean stores into an int
  jsoninfo: set_plugin_boolean stores into an int
  android: fix build on 32 bit platform (see 0295e11)
  android: use the machine specific NDK instead of always the 32bit variant