Fix bug #9034 - Typo in set_re_uid() call when USE_SETRESUID selected in configure.

Fix bug #9034 - Typo in set_re_uid() call when USE_SETRESUID selected in configure.

Previous code only set the real euid, not the effective one. This is not a security issue
as this is *only* used in the quota code, and only between code that brackets
it with save_re_uid()/restore_re_uid(), Also this is not used on most platforms
(we use USE_SETREUID by preference) but it's better to have this right.
(cherry picked from commit ceed322622b46be3745b32a5f6a02e634bfe1789)
(cherry picked from commit a224e4cc1dbb2578813ccffb80e88d9ec92516ce)