avutil/x86: reenable ff_update_lls_avx()

The bug has been fixed in c8b920a9 by Loren Merritt
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/x86/lls.asm

@@ -125,7 +125,7 @@ cglobal update_lls, 2,5,8, ctx, var, i, j, covar2
 .ret:
     REP_RET
 
-%if HAVE_AVX_EXTERNAL && 0
+%if HAVE_AVX_EXTERNAL
 INIT_YMM avx
 cglobal update_lls, 3,6,8, ctx, var, count, i, j, count2
     %define covarq ctxq

libavutil/x86/lls_init.c

@@ -35,7 +35,7 @@ av_cold void ff_init_lls_x86(LLSModel *m)
         if (m->indep_count >= 4)
             m->evaluate_lls = ff_evaluate_lls_sse2;
     }
-    if (EXTERNAL_AVX(cpu_flags) && 0) {
+    if (EXTERNAL_AVX(cpu_flags)) {
         m->update_lls = ff_update_lls_avx;
     }
 }