Log Message:
libebur128: Update to 1.2.4

News
----

v1.2.4 released:
 * Fix broken `ebur128_loudness_global_multiple()` function. Since v1.1.0 it
   calculated the relative threshold just from the last state given to it,
   resulting in wrong values.
 * More tests
 * Fix some minor build issues
 * Fix uninitialized memory in `ebur128_init()`, possibly resulting in wrong
   values

v1.2.3 released:
 * Fix uninitialized memory access during true peak scanning (bug #72)

v1.2.2 released (v1.2.1 was mistagged):
 * Fix a null pointer dereference when doing true peak scanning of 192kHz data

v1.2.0 released:

 * New functions for real time loudness/peak monitoring:
   * `ebur128_loudness_window()`
   * `ebur128_set_max_window()`
   * `ebur128_set_max_history()`
   * `ebur128_prev_sample_peak()`
   * `ebur128_prev_true_peak()`
 * New FIR resampler for true peak calculation, removing Speex dependency
 * Add true peak conformance tests
 * Bug fixes