msac.c: remove fns needed to build dav1d on arm again (#1456)

These were added specifically for c2rust previously, but it seems
upstream dav1d changes made it unnecessary and break arm dav1d builds.

Author: kkysen

src/msac.c

@@ -218,43 +218,3 @@ void dav1d_msac_init(MsacContext *const s, const uint8_t *const data,
     msac_init_x86(s);
 #endif
 }
-
-// C2RUST:
-
-unsigned dav1d_msac_decode_symbol_adapt4(MsacContext *s, uint16_t *cdf,
-                                          size_t n_symbols)
-{
-    return dav1d_msac_decode_symbol_adapt4_impl(s, cdf, n_symbols);
-}
-
-unsigned dav1d_msac_decode_symbol_adapt8(MsacContext *s, uint16_t *cdf,
-                                          size_t n_symbols)
-{
-    return dav1d_msac_decode_symbol_adapt8_impl(s, cdf, n_symbols);
-}
-
-unsigned dav1d_msac_decode_symbol_adapt16(MsacContext *s, uint16_t *cdf,
-                                          size_t n_symbols)
-{
-    return dav1d_msac_decode_symbol_adapt16_impl(s, cdf, n_symbols);
-}
-
-unsigned dav1d_msac_decode_bool_adapt(MsacContext *s, uint16_t *cdf)
-{
-    return dav1d_msac_decode_bool_adapt_impl(s, cdf);
-}
-
-unsigned dav1d_msac_decode_bool_equi(MsacContext *s)
-{
-    return dav1d_msac_decode_bool_equi_impl(s);
-}
-
-unsigned dav1d_msac_decode_bool(MsacContext *s, unsigned f)
-{
-    return dav1d_msac_decode_bool_impl(s, f);
-}
-
-unsigned dav1d_msac_decode_hi_tok(MsacContext *s, uint16_t *cdf)
-{
-    return dav1d_msac_decode_hi_tok_impl(s, cdf);
-}