gcc14: 14.2.0 -> 14-20241116

The stable release has too many AArch64 issues, but they seem to
have been fixed upstream; Arch is shipping a Git snapshot. The next
stable release should be out by the time 25.05 is finishing up,
so this should be okay as a temporary solution.

This is the GCC 14-20241116 snapshot. We use that identifier as our
package version, diverging from our usual unstable version convention,
because it identifies itself as “gcc (GCC) 14.2.1 20241116” and
comes in `gcc-14-20241116.tar.xz`; 20241116 is therefore a useful
version identifier to use verbatim, and 14.2.0-unstable-2024-11-16
would potentially be confusing for a version that calls itself
14.2.1. The next stable release from the GCC 14 branch will be 14.3.0,
so there should be no ambiguity here.

Getting this version is a little complicated; we need the precompiled
`flex(1)` output that these Git snapshots don’t include. Thankfully,
the source file hasn’t changed since 14.2.0, so we can simply
download 14.2.0 too and extract the precompiled file. A little
merging finesse is required for the `aarch64-darwin` patch, which we
also upgrade.

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