Use getpwuid_r instead of getpwuid, so that we don't trash getpw*() internal
buffers.

kde does (kdm/client/backend.c):
p = getpwnam();
pam_setcred() (which calls getpwuid in pam_afslog);

Use getpwuid_r instead of getpwuid, so that we don't trash getpw*() internal
buffers.

kde does (kdm/client/backend.c):
p = getpwnam();
pam_setcred() (which calls getpwuid in pam_afslog);
setusercontext(...,p,p->pw_uid,...) (now with trashed p data...)

XXX: pullups.

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