Define ALIGNOF_MAX_ALIGN_T for riscv32 #298

Job	Run time
Rustfmt and Clippy	2m 14s
aarch64-unknown-linux-gnu	5m 15s
x86_64-unknown-linux-gnu (stable)	15m 57s
aarch64-apple-darwin (stable)	4m 48s
Benchmarks using x86_64-unknown-linux-gnu (nightly)	1m 0s
x86_64-apple-darwin	1s
x86_64-unknown-linux-gnu (msrv)	16m 50s
x86_64-unknown-linux-gnu (nightly)	16m 3s
x86_64-unknown-linux-musl	6m 11s
	1h 8m 19s

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