Fix arm64 linux check

Author: dudoslav

cmake/DownloadTileDB.cmake

@@ -92,7 +92,7 @@ function(detect_artifact_name OUT_VAR)
                         SET(${OUT_VAR} TILEDB_MACOS-ARM64 PARENT_SCOPE)
                 endif()
         else() # Linux
-                if(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")
+                if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
                         SET(${OUT_VAR} TILEDB_LINUX-ARM64 PARENT_SCOPE)
                 else()
                         SET(${OUT_VAR} TILEDB_LINUX-X86_64 PARENT_SCOPE)