[Rpm-maint] [rpm-software-management/rpm] Use common error logic regardless of setexecfilecon() availability (#1079)

[Panu Matilainen]

Refactor the custom exec context setting code to look like setexecfilecon()
in case the real one is not available to eliminate pesky behavioral
differences between the two cases.

This fixes a concrete bug of libselinux setexecfilecon() returning with
an error when security_getenforce() returns with -1 (such as a bare
chroot with no /sys mounts etc), causing us to spit out useless error
messages in that case ever since fixing the bogus if-logic in
commit ab601b882b9d9d8248250111317615db1aa7b7c6.

Fixes: #1077
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1079

-- Commit Summary --

  * Use common error logic regardless of setexecfilecon() availability

-- File Changes --

    M plugins/selinux.c (46)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1079.patch
https://github.com/rpm-software-management/rpm/pull/1079.diff

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https://github.com/rpm-software-management/rpm/pull/1079
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