MFH: r429588

• fix third party module build e.g. mod_mpm_itk by removing -Werror from configure.in
• bump PORTREVISON (fix changes config_vars.mk that is used to build third party modules)

PR: 215594
Submitted by: Marcelo Araujo
Sponsored by: iXsystems

Approved by: ports-secteam (blanket)