btrfs-progs: crypto: add missing ssse3 header for blake2-sse2 implementation

Otherwise, the following error occurs:

| In file included from crypto/blake2b-sse2.c:30:
| crypto/blake2b-sse2.c: In function 'blake2b_compress_sse2':
| crypto/blake2b-round.h:32:22: warning: implicit declaration of function '_mm_shuffle_epi8'; did you mean '_mm_shuffle_epi32'? [-Wimplicit-function-declaration]
|    32 |     : (-(c) == 24) ? _mm_shuffle_epi8((x), r24) \
|       |                      ^~~~~~~~~~~~~~~~

Note: it's not yet clear what affects this build failure as it otherwise
builds in the tested configurations (gcc/clang, arch, distro), but it
apparently fixes the build in some environments.

Pull-request: #588
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
[ add note ]
Signed-off-by: David Sterba <dsterba@suse.com>

Author: kanavin

crypto/blake2b-sse2.c

@@ -23,6 +23,9 @@
 #ifdef HAVE_SSE2
 
 #include <emmintrin.h>
+#if defined(HAVE_SSSE3)
+#include <tmmintrin.h>
+#endif
 #if defined(HAVE_XOP)
 #include <x86intrin.h>
 #endif