sbc: Fix issue when compiling without SBC_BUILD_WITH_SSE_SUPPORT

  CC       sbc/sbc_primitives_sse.lo
sbc/sbc_primitives_sse.c:317:6: error: no previous declaration for ‘sbc_init_primitives_sse’ [-Werror=missing-declarations]
  317 | void sbc_init_primitives_sse(struct sbc_encoder_state *state)
      |      ^~~~~~~~~~~~~~~~~~~~~~~
2 files changed