Allow building with gcc-14 + enable SSL certificate validation

Rebecca N. Palmerrequested to merge
rnpalmer-guest/libgda5:fix1075169 into debian/latest

Suggested d/changelog:

  * Allow building with gcc-14. (Closes: #1075169)
  * Enable SSL certificate validation. (Closes: #993592)

All these changes are from upstream. It builds (which the current package doesn't), but has not been tested beyond that.

In the longer term it would probably be a good idea to move to a more recent upstream version, but since that is a compatibility break I have not attempted it.

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