rust - update to version 1.64.0

[fritzkink]

currently there is no system/library/g++-4-runtime installed only two links are needed to build the package:

  `ln -s $(GCC_LIBDIR)/libgcc_s.so.1 /usr/lib/$(MACH64)/libgcc_s.so.1`
  `ln -s $(GCC_LIBDIR)/liblibssp.so.0 /usr/lib/$(MACH64)/libssp.so.0`

another idea could be to usr LD_LIBRARY_PATH only caveat it starts building included llvm and fails (maybe someone can chime in)

  `export LD_LIBRARY_PATH=$(GCC_LIBDIR)`

Also some other package can provide this two links (which one?) Basically it proves that the very old gcc is not needed as also mentioned by Joshua M. Clulow