[Bug 277333] Mk/Features/lto.mk: passing -C lto=no has unexpected results

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277333

            Bug ID: 277333
           Summary: Mk/Features/lto.mk: passing -C lto=no has unexpected
                    results
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: pkubaj@FreeBSD.org
          Reporter: jbeich@FreeBSD.org
                CC: ports-bugs@FreeBSD.org, rust@FreeBSD.org

Regressed by ports 33b550f03016 + ports 1b286170da8f. Consumers with
unconditional LTO_UNSAFE break on FreeBSD 13.2 due to LLVM mismatch e.g.,

https://pkg-status.freebsd.org/beefy16/data/132amd64-default/3229bb06d7d7/logs/errors/veloren-weekly-s20240215_1.log

  = note: ld: error:
/wrkdirs/usr/ports/games/veloren-weekly/work/target/x86_64-unknown-freebsd/release/deps/libveloren_common_frontend-69e7ee9b38f43147.rlib(veloren_common_frontend-69e7ee9b38f43147.veloren_common_frontend.bdf2b8bf52e7e608-cgu.05.rcgu.o):
Opaque pointers are only supported in -opaque-pointers mode (Producer:
'LLVM17.0.6-rust-1.75.0-stable' Reader: 'LLVM 14.0.5')

https://pkg-status.freebsd.org/beefy16/data/132amd64-default/3229bb06d7d7/logs/errors/jumpy-0.10.0_1.log
https://pkg-status.freebsd.org/ampere3/data/132arm64-default/e9c9c73181b5/logs/errors/jumpy-0.10.0.log

  = note: ld: error:
/wrkdirs/usr/ports/games/jumpy/work/target/x86_64-unknown-freebsd/release/deps/libhumantime_serde-fff4eb01f7a1da96.rlib(humantime_serde-fff4eb01f7a1da96.humantime_serde.af9df457ca654d80-cgu.0.rcgu.o):
Opaque pointers are only supported in -opaque-pointers mode (Producer:
'LLVM17.0.6-rust-1.76.0-stable' Reader: 'LLVM 14.0.5')
  = note: ld: error:
/wrkdirs/usr/ports/games/jumpy/work/target/aarch64-unknown-freebsd/release/deps/libhumantime_serde-e707afda9551c5e2.rlib(humantime_serde-e707afda9551c5e2.humantime_serde.cd5b947a98481e3d-cgu.0.rcgu.o):
Opaque pointers are only supported in -opaque-pointers mode (Producer:
'LLVM17.0.6-rust-1.75.0-stable' Reader: 'LLVM 14.0.5')

https://pkg-status.freebsd.org/beefy16/data/132amd64-default/3229bb06d7d7/logs/errors/texlab-4.2.0_15.log

  = note: ld: error:
/wrkdirs/usr/ports/devel/texlab/work/target/x86_64-unknown-freebsd/release/deps/libfern-f198c6d179095779.rlib(fern-f198c6d179095779.fern.468fa5bf8ac90584-cgu.00.rcgu.o):
Opaque pointers are only supported in -opaque-pointers mode (Producer:
'LLVM17.0.6-rust-1.76.0-stable' Reader: 'LLVM 14.0.5')

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