zstdConfig.cmake port is NOT noarch

[barracuda156]

The port hardcodes bitness of the OS:

# if the installed or the using project don't have CMAKE_SIZEOF_VOID_P set, ignore it:
if("${CMAKE_SIZEOF_VOID_P}" STREQUAL "" OR "4" STREQUAL "")
  return()
endif()

# check that the installed version has the same 32/64bit-ness as the one which is currently searching:
if(NOT CMAKE_SIZEOF_VOID_P STREQUAL "4")
  math(EXPR installedBits "4 * 8")
  set(PACKAGE_VERSION "${PACKAGE_VERSION} (${installedBits}bit)")
  set(PACKAGE_VERSION_UNSUITABLE TRUE)
endif()

In result, for example, on ppc64 it is broken: noarch wipes out MacPorts-passed arch setting, the port is built for ppc, then any dependency calling it fails to configure.