unix: expose with_dlerror to the end users #232

Job	Run time
windows-test (nightly, x86_64-pc-windows-gnu)	1m 1s
native-test (nightly, ubuntu-latest)	19s
windows-test (nightly, i686-pc-windows-gnu)	1m 11s
cross-ios-build (nightly, aarch64-apple-ios)	24s
native-test (nightly, windows-latest)	44s
bare-cross-build (nightly, x86_64-unknown-haiku)	25s
windows-test (stable, x86_64-pc-windows-gnu)	1m 41s
cross-ios-build (nightly, x86_64-apple-ios)	25s
native-test (nightly, macOS-latest)	1m 8s
bare-cross-build (nightly, x86_64-unknown-openbsd)	28s
windows-test (stable, i686-pc-windows-gnu)	59s
cross-ios-build (stable, aarch64-apple-ios)	10s
native-test (stable, ubuntu-latest)	9s
bare-cross-build (nightly, x86_64-unknown-redox)	27s
cross-ios-build (stable, x86_64-apple-ios)	11s
native-test (stable, windows-latest)	1m 14s
bare-cross-build (nightly, x86_64-fuchsia)	25s
native-test (stable, macOS-latest)	22s
bare-cross-build (nightly, wasm32-unknown-unknown)	23s
native-test (1.56.0, ubuntu-latest)	3m 24s
native-test (1.56.0, windows-latest)	4m 31s
native-test (1.56.0, macOS-latest)	7m 39s
	27m 40s

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