Use immintrin.h everywhere for intrinsics

configure.ac

@@ -348,11 +348,7 @@ CXXFLAGS="$CXXFLAGS $SSE41_CXXFLAGS"
 AC_MSG_CHECKING(for SSE4.1 intrinsics)
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
     #include <stdint.h>
-    #if defined(_MSC_VER)
     #include <immintrin.h>
-    #elif defined(__GNUC__)
-    #include <x86intrin.h>
-    #endif
   ]],[[
     __m128i l = _mm_set1_epi32(0);
     return _mm_extract_epi32(l, 3);
@@ -367,11 +363,7 @@ CXXFLAGS="$CXXFLAGS $AVX2_CXXFLAGS"
 AC_MSG_CHECKING(for AVX2 intrinsics)
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
     #include <stdint.h>
-    #if defined(_MSC_VER)
     #include <immintrin.h>
-    #elif defined(__GNUC__) && defined(__AVX2__)
-    #include <x86intrin.h>
-    #endif
   ]],[[
     __m256i l = _mm256_set1_epi32(0);
     return _mm256_extract_epi32(l, 7);
@@ -386,11 +378,7 @@ CXXFLAGS="$CXXFLAGS $SHANI_CXXFLAGS"
 AC_MSG_CHECKING(for SHA-NI intrinsics)
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
     #include <stdint.h>
-    #if defined(_MSC_VER)
     #include <immintrin.h>
-    #elif defined(__GNUC__)
-    #include <x86intrin.h>
-    #endif
   ]],[[
     __m128i i = _mm_set1_epi32(0);
     __m128i j = _mm_set1_epi32(1);

src/crypto/sha256_avx2.cpp

@@ -1,11 +1,7 @@
 #ifdef ENABLE_AVX2
 
 #include <stdint.h>
-#if defined(_MSC_VER)
 #include <immintrin.h>
-#elif defined(__GNUC__)
-#include <x86intrin.h>
-#endif
 
 #include <crypto/sha256.h>
 #include <crypto/common.h>

src/crypto/sha256_shani.cpp

@@ -9,11 +9,7 @@
 #ifdef ENABLE_SHANI
 
 #include <stdint.h>
-#if defined(_MSC_VER)
 #include <immintrin.h>
-#elif defined(__GNUC__)
-#include <x86intrin.h>
-#endif
 
 #include <crypto/common.h>
 

src/crypto/sha256_sse41.cpp

@@ -1,11 +1,7 @@
 #ifdef ENABLE_SSE41
 
 #include <stdint.h>
-#if defined(_MSC_VER)
 #include <immintrin.h>
-#elif defined(__GNUC__)
-#include <x86intrin.h>
-#endif
 
 #include <crypto/sha256.h>
 #include <crypto/common.h>