Fix missing LD flag for msvc makefile (#99)

Author: tobil4sk

lua-simdjson-scm-1.rockspec

@@ -35,6 +35,7 @@ build = {
          build_variables = {
             LUA_LIBDIR="$(LUA_LIBDIR)",
             LUALIB="$(LUALIB)",
+            LD="$(LD)",
          }
       }
    }