avcodec/mpegaudio_tablegen: Don't inappropriately use static array

Each invocation of this function is only entered once, so using a static
array makes no sense (and given that the whole array is reinitialized at
the beginning of this function, it wouldn't even make sense if the
function were called multiple times).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/mpegaudio_tablegen.h

@@ -59,7 +59,7 @@ static av_cold void mpegaudio_tableinit(void)
         M_SQRT2               , /* 2 ^ (2 * 0.25) */
         1.68179283050742908606, /* 2 ^ (3 * 0.25) */
     };
-    static double pow43_lut[16];
+    double pow43_lut[16];
     double exp2_base = 2.11758236813575084767080625169910490512847900390625e-22; // 2^(-72)
     double exp2_val;
     double pow43_val = 0;