avcodec/ituh263dec: Don't initialize unused RL VLCs

The ff_rl_intra_aic RLTable is only used by ituh263dec and ituh263enc;
the former is the only user of its RL VLC tables. It uses only the very
first one of these VLC tables, but up until now all 32 are initialized,
wasting 68696B from the .bss segment (or that amount of memory if this
decoder has actually been used). This commit changes this.

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

libavcodec/ituh263dec.c

@@ -126,7 +126,7 @@ av_cold void ff_h263_decode_init_vlc(void)
         ff_rl_init(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]);
         ff_rl_init(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]);
         INIT_VLC_RL(ff_h263_rl_inter, 554);
-        INIT_VLC_RL(ff_rl_intra_aic, 554);
+        INIT_FIRST_VLC_RL(ff_rl_intra_aic, 554);
         INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
                  &ff_h263_mbtype_b_tab[0][1], 2, 1,
                  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);