Merge commit '29abb04e'

* commit '29abb04e':
  libspeexdec: If the channel count is not valid, decode as stereo.
  libspeexdec: improve setting of Speex mode and sample rate
  libspeex: Add a private option for enabling VAD
  xtea: Test inplace decryption
  xtea: Fix CBC decryption when src==dst
  xtea: Factorize testing into a separate function
  configure: Refactor HAVE_ options available on the command line
  avconv/avprobe: Add missing 'void' to exit_program() definition
  Allow use of strncpy()
  blowfish: Add more tests
  blowfish: Fix CBC decryption with dst==src
  blowfish: Factorize testing into a separate function

Conflicts:
	configure
	libavcodec/libspeexdec.c
	libavutil/xtea.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>