Log Message:
rubberbrand: update to 1.9.2

Changes in Rubber Band v1.9.2

 * Introduce a built-in FFT option to be a good default when no
   requirements point to a particular external library preference
 * Fix potential crash following some reconfigure options. Thanks
   to Michael Tyson for reporting this
 * Ensure Accelerate is listed in generated pkg-config if required
 * Check for existence of sincos in configuration
 * Fix host identification when cross-compiling

The API is unchanged and the library is binary compatible with
version 1.7.