[Rpm-maint] [rpm-software-management/rpm] Make configure cope with multiple users/groups with ID 0 (#377)

[Mike Crowe]

If /etc/passwd contains multiple users with UID 0 then user_with_uid0 will
contain a line feed which results in config.h containing:

 #define UID_0_USER "root

(i.e. without a closing quote.)

The same problem occurs with /etc/group.

Let's only emit the first match in each case so that there is only ever a
single result.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/377

-- Commit Summary --

  * Make configure cope with multiple users/groups with ID 0

-- File Changes --

    M configure.ac (4)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/377.patch
https://github.com/rpm-software-management/rpm/pull/377.diff

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