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Fix unaligned load with MSVC

MSVC doesn't have a real __m128i_u, so it would generate an aligned
store, resulting in a segfault. Adding explicit loadu/stureu
intrinsics to make sure the compiler generates unaligned load/store

--- a/silk/x86/NSQ_del_dec_avx2.c

+++ b/silk/x86/NSQ_del_dec_avx2.c

@@ -986,7 +986,7 @@

         for (i = NSQ->sLTP_shp_buf_idx - psEncC->ltp_mem_length; i < NSQ->sLTP_shp_buf_idx; i+=4)

         {

             __m128i_u* p = (__m128i_u*)&NSQ->sLTP_shp_Q14[i];

-            *p = silk_mm_smulww_epi32(*p, gain_adj_Q16);

+            _mm_storeu_si128(p, silk_mm_smulww_epi32(_mm_loadu_si128(p), gain_adj_Q16));

         }

         /* Scale long-term prediction state */

-- 

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