MDEV-16860 MyRocks: support CRC32 instructions on Winx64

Compile on Windows MSVC with -DHAVE_SSE2 and -DHAVE_PCLMUL

It is safe, since code will do also runtime checks via cpuid(), before
using the instructions, and will fallback to slower versions,
if instructions are not available.

storage/rocksdb/build_rocksdb.cmake

@@ -376,7 +376,9 @@ SET(SOURCES)
 FOREACH(s ${ROCKSDB_SOURCES})
   list(APPEND SOURCES ${ROCKSDB_SOURCE_DIR}/${s})
 ENDFOREACH()
-
+IF(MSVC)
+  add_definitions(-DHAVE_SSE42 -DHAVE_PCLMUL)
+ENDIF()
 IF(CMAKE_VERSION VERSION_GREATER "2.8.10")
   STRING(TIMESTAMP GIT_DATE_TIME "%Y-%m-%d %H:%M:%S")
 ENDIF()