Bug 1801850 - `media/libopus`: add cluster 2 to ignore list. r=sylvestre

Differential Revision: https://phabricator.services.mozilla.com/D163106

media/libopus/gen-sources.py

@@ -11,6 +11,7 @@ import re
 # These files are not used, ignore them.
 ignore_list = [
     'silk/float/regularize_correlations_FLP.c',
+    'silk/float/LPC_inv_pred_gain_FLP.c',
 ]
 
 def should_ignore(value):

media/libopus/sources.mozbuild

@@ -239,7 +239,6 @@ silk_sources_float = [
     'silk/float/inner_product_FLP.c',
     'silk/float/k2a_FLP.c',
     'silk/float/LPC_analysis_filter_FLP.c',
-    'silk/float/LPC_inv_pred_gain_FLP.c',
     'silk/float/LTP_analysis_filter_FLP.c',
     'silk/float/LTP_scale_ctrl_FLP.c',
     'silk/float/noise_shape_analysis_FLP.c',