The pname to uid functionality at present assumes there is
an implementation of getpwnam() and that the local user
identifier is an integer. On Windows, the local user identifier
is a SId. Add NO_LOCALNAME as a build option so that Windows
(for now) can build without providing a getpwnam() implementation.
Change-Id: I04cfd6d2cd52e6228733f1da1dab420b453e6566