Bug 1945694 - build(rust): upgrade cc 1.0.89 → 1.2.12 r=#supply-chain-reviewers,glandium

`cc` upstream broke a few things that have been handled by other patches
motivated specifically by this upgrade:

1. `cc::Build` now rejects unknown targets not baked in. This breaks
   `swgl`'s usage of the `SWGL` target. We migrated away from this
   behavior in D235480.
2. `cc::Build::is_like_msvc`'s underlying logic changed, and now does
   not return `true`. This has been worked around in D236305, and will
   be removed after this patch in D236650.
3. PGO flag inheritance changed, which required us to explicitly pass
   some PTO- and LTO-related flags to keep compiling. This has been
   adjusted in D236966.

These are handled, and there should be no concern (finally) in landing
this. 🫡 Woot!

Differential Revision: https://phabricator.services.mozilla.com/D236957

Author: ErichDonGubler