Update `bindgen` to `0.70` (#123) #353

Job	Run time
build_static_and_test_ubuntu	6m 1s
build_dynamic_and_test_windows_pre	2m 20s
build_dynamic_and_test_macos	1m 41s
build_dynamic_and_test_ubuntu	1m 42s
build_static_and_test_ubuntu_with_system_ffmpeg	59s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static, -Ctarget-feature=+cr...	1m 40s
docs_rs_check	1m 43s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static-md)	1m 43s
rust_clippy_check_ubuntu	6m 35s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows, true)	1m 40s
rust_clippy_check_windows	1m 12s
rustfmt_check (macos-latest)	7s
rustfmt_check (windows-latest)	18s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static, -Ctarget-feature=+crt-...	2m 3s
rustfmt_check (ubuntu-latest)	4s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static-md)	1m 43s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows, true)	1m 44s
build_dynamic_and_test_windows	1m 32s
	34m 47s

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