Fixed compilation for aarch64 (#66)

tokenizers_c.a was not being build for aarch64

Author: NaveenMittal0

CMakeLists.txt

@@ -19,6 +19,9 @@ message(STATUS "system-name" ${CMAKE_SYSTEM_NAME})
 
 if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
   list(APPEND TOKENIZERS_C_LINK_LIBS ${CMAKE_DL_LIBS})
+  if (CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
+    set(TOKENIZERS_CPP_CARGO_TARGET aarch64-unknown-linux-gnu)
+  endif()
 elseif (CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
   set(TOKENIZERS_CPP_CARGO_TARGET wasm32-unknown-emscripten)
 elseif (CMAKE_SYSTEM_NAME STREQUAL "iOS")