Skip bindgen 0.70's layout tests before Rust 1.77 #945

Job	Run time
rustfmt	11s
clippy	13m 42s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	2m 0s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	3m 18s
Test features	7m 15s
Test (stable)	2m 11s
Test FIPS integration	2m 54s
Test (arm-android)	1m 59s
Test (arm64-android)	2m 8s
Test (i686-android)	2m 5s
Test (x86_64-android)	1m 54s
Test (aarch64-ios)	2m 31s
Test (aarch64-ios-sim)	2m 19s
Test (x86_64-ios)	3m 57s
Test (i686-linux)	2m 26s
Test (arm-linux)	2m 20s
Test (aarch64-linux)	2m 13s
Test (arm64-macos)	2m 22s
Test (x86_64-macos)	2m 38s
Test (x86_64-mingw)	6m 0s
Test (i686-msvc)	5m 27s
Test (x86_64-msvc)	5m 56s
	1h 17m 46s

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