[redis-plus-plus] Disable werror by default to avoid GCC-16 error

[uilianries]

Summary

Changes to recipe: redis-plus-plus/1.3.15

Motivation

close #30798

Details

I can reproduce the reported scenario: When building redis-plus-plus/1.3.15 with GCC 16, I have the following error:

/home/conan/.conan2/p/b/redis6c5fffd311a1b/b/src/src/sw/redis++/reply.h: In constructor ‘sw::redis::ParseError::ParseError(const std::string&, const redisReply&)’:
/home/conan/.conan2/p/b/redis6c5fffd311a1b/b/src/src/sw/redis++/reply.h:54:60: error: ‘<unknown>’ may be used uninitialized [-Werror=maybe-uninitialized]
   54 |             const redisReply &reply) : ProtoError(_err_info(expect_type, reply)) {}

redis-plus-plus-1.3.15-linux-amd64-gcc16-release-static.log

After applying this patch, by removing multiple declarations of Werror from CMakeLists, I can build without errors:

redis-plus-plus-1.3.15-linux-amd64-gcc16-release-static-patched.log

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• Checked that this PR is not a duplicate: list of PRs by recipe
• If this is a bug fix, please link related issue or provide bug details
• Tested locally with at least one configuration using a recent version of Conan

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