Mirror `c_char` configuration from `rust-lang/rust` #498

Job	Run time
Check #[cfg]s	14s
Style check	21s
Test tier1 (i686-unknown-linux-gnu, true, ubuntu-24.04)	57s
Verify build (stable, ubuntu-24.04)	2m 41s
Test tier1 (x86_64-unknown-linux-gnu, true, ubuntu-24.04)	57s
Verify build (stable, macos-14)	31s
Test tier1 (aarch64-apple-darwin, macos-14)	42s
Verify build (stable, windows-2022)	4m 20s
Test tier1 (x86_64-pc-windows-gnu, windows-2022, 64, x86_64)	53s
Verify build (nightly, ubuntu-24.04)	17m 29s
Test tier1 (x86_64-pc-windows-msvc, windows-2022)	56s
Verify build (nightly, macos-14)	58s
Test tier1 (i686-pc-windows-msvc, windows-2022)	53s
Verify build (nightly, windows-2022)	4m 22s
Verify build (1.63.0, ubuntu-24.04)	4m 24s
Verify build (1.63.0, macos-14)	1m 30s
Verify build (1.63.0, windows-2022)	6m 12s
Verify build (beta, ubuntu-24.04)	3m 22s
Test tier2	0s
Test tier2 VM	0s
success	1s
	51m 43s

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