Remove support for FRC (#1268) #1993

Job	Run time
Test build-std (aarch64-tvos)	2m 43s
Test build-std (aarch64-tvos-sim)	1m 50s
Test (stable)	1m 45s
Test build-std (x86_64-tvos)	1m 57s
Test (beta)	1m 28s
Test (nightly)	1m 11s
Test (linux32)	2m 15s
Test wasm (wasm32-unknown-unknown)	25s
Clippy	14s
Test (macos)	3m 40s
Test (aarch64-macos)	1m 54s
Test CUDA support	54s
MSRV (ubuntu-latest)	22s
MSRV (windows-latest)	39s
Rustfmt	17s
MSRV (macos-latest)	28s
Test (aarch64-ios)	1m 33s
Test (win32)	2m 27s
Test wasm32-wasip1-thread	52s
Test (win64)	3m 14s
Test (mingw32)	2m 56s
semver-checks	18s
Test (mingw64)	3m 7s
Test (windows-2019)	2m 55s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 25s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	4m 17s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	5m 6s
	52m 12s

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