Use ForeignType::into_ptr wherever applicable #894

Job	Run time
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	2m 57s
rustfmt	4s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	4m 45s
clippy	8m 54s
Test features	7m 31s
Test FIPS integration	3m 14s
Test (stable)	2m 6s
Test (arm-android)	2m 14s
Test (arm64-android)	2m 1s
Test (i686-android)	2m 3s
Test (x86_64-android)	1m 56s
Test (aarch64-ios)	3m 26s
Test (aarch64-ios-sim)	3m 29s
Test (x86_64-ios)	2m 23s
Test (i686-linux)	2m 42s
Test (arm-linux)	3m 23s
Test (aarch64-linux)	2m 16s
Test (arm64-macos)	2m 50s
Test (x86_64-macos)	2m 44s
Test (x86_64-mingw)	7m 50s
Test (i686-msvc)	7m 47s
Test (x86_64-msvc)	6m 29s
	1h 23m 4s

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