util.h: add new UNPROTECT_ERRNO macro
THis is inspired by #11395, but much simpler.
(cherry picked from commit 840f606d88fef2f5d240b2d759ce7b951354d5bb)
Resolves: #1691691
patch_name: 0122-util.h-add-new-UNPROTECT_ERRNO-macro.patch
present_in_specfile: true
location_in_specfile: 122
squash_commits: true