ci: Drop BDB1539 hack

This shouldn't be needed anymore.

Closes: #1365
Approved by: cgwalters

ci/libbuild.sh

@@ -1,18 +1,7 @@
 #!/usr/bin/bash
 
 pkg_upgrade() {
-    # https://bugzilla.redhat.com/show_bug.cgi?id=1483553
-    ecode=0
-    yum -y distro-sync 2>err.txt || ecode=$?
-    if test ${ecode} '!=' 0 && grep -q -F -e "BDB1539 Build signature doesn't match environment" err.txt; then
-        rpm --rebuilddb
-        yum -y distro-sync
-    else
-        if test ${ecode} '!=' 0; then
-            cat err.txt
-            exit ${ecode}
-        fi
-    fi
+    yum -y distro-sync
 }
 
 make() {