Merge bitcoin/bitcoin#27013: ci: avoid using `-Werror` for older compilers

71383f2fad065378393ef55b6d65e14c656b7301 ci: avoid using -Werror for older compilers (fanquake)

Pull request description:

  Don't enable `-Werror` (in the CI) for compilers at least older than our current release compiler (GCC 10). It provides little-to-no value, other than turning compiler bugs & false positives into build failures, and we aren't going to mutate perfectly fine/working code, for the sake of avoid a warning that shouldn't even exist.

  I also do not see the point of playing whack-a-mole and turning off various warnings/trying to further work around the broken compiler, just to acheive warningless builds for the sake of warningless builds.

  One anecdote from ["How SQLite Is Tested"](https://www.sqlite.org/testing.html):
  > Static analysis has found a few bugs in SQLite, but those are the
  > exceptions. More bugs have been introduced into SQLite while trying
  > to get it to compile without warnings than have been found by static
  > analysis.

ACKs for top commit:
  hebasto:
    ACK 71383f2fad065378393ef55b6d65e14c656b7301
  jarolrod:
    ACK 71383f2fad065378393ef55b6d65e14c656b7301

Tree-SHA512: 20ed3dcf54fb17a7d9f0d8ca68c0ad2ee8f171f8bd61673a428f3123ab322c24cd9833f65915489bc8cebeffc37fd683a30e9669684b219960e69ddc7adae5bd

0 files changed, 0 insertions, 0 deletions