### Description

At this time, it's not possible to build Kamailio on `CentOS 7` on `master` or `6.0.0`. Some code on `ims_auth` and `ims_registrar_pcscf` is not compliant with old `gcc`.

#### Pre-Submission Checklist <!-- Go over all points below, and after creating the PR, tick all the checkboxes that apply --> <!-- All points should be verified, otherwise, read the CONTRIBUTING guidelines from above--> <!-- If you're unsure about any of these, don't hesitate to ask on sr-dev mailing list --> - [x] Commit message has the format required by CONTRIBUTING guide - [x] Commits are split per component (core, individual modules, libs, utils, ...) - [x] Each component has a single commit (if not, squash them into one commit) - [x] No commits to README files for modules (changes must be done to docbook files in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change - [x] Small bug fix (non-breaking change which fixes an issue) - [ ] New feature (non-breaking change which adds new functionality) - [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist: - [ ] PR should be backported to stable branches - [x] Tested changes locally - [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Additional Information

Tested on my own, and build now works just fine.

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

https://github.com/kamailio/kamailio/pull/4145

-- Commit Summary --

* ims_auth: Fix CentOS 7 Build * ims_auth: Fix CentOS 7 Build * ims_registrar_pcscf: Fix CentOS 7 Build * Merge branch 'master' into bundasmanu/fix_centos_7_build

-- File Changes --

M src/modules/ims_auth/auth_vector.c (11) M src/modules/ims_registrar_pcscf/subscribe.c (5)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/4145.patch https://github.com/kamailio/kamailio/pull/4145.diff