ITS#9348 Stop using plain strerror()

3 jobs for its9348 in 29 minutes and 47 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #2304
build-gnutls-mit

00:26:11

passed #2302
build-no-threads-no-slapd

00:03:35

passed #2303
build-openssl-heimdal

00:28:52