cmake _HAVE_GETPWUID examples

Kitware/VTK ThirdParty/hdf5/vtkhdf5/config/cmake_ext_mod/ConfigureChecks.cmake :432 

CHECK_FUNCTION_EXISTS (getpwuid        ${HDF_PREFIX}_HAVE_GETPWUID)

Tencent/Forward source/third_party/hdf5/config/cmake_ext_mod/ConfigureChecks.cmake :483 

CHECK_FUNCTION_EXISTS (getpwuid        ${HDF_PREFIX}_HAVE_GETPWUID)