Various fixes for upcoming release

Description

GLIBCXX assertions are enabled by default on the latest versions of GCC, this introduces a dependency on the standard libarary which we prefer to avoid, so we disable them.

This patch makes it explicit that the only supported compilers are GCC >= 11 and Clang >= 16. GCC 10 doesn't support bitcast and Clang 15 doesn't support our use of concepts.

Sometimes CMake installs libopenrng in a lib64 directory, so this patch makes the examples look for the library there as well.

Checklist

Please ensure:

• You are familiar with the contribution guidelines
• All new functionality has sufficient test coverage
• All unit tests are passing
• Any C++ code has been formatted with clang-format
• The changelog is up to date
• Implementation statuses are up to date
• Your contribution meets OpenRNG's license terms