boring-sys: include HPKE header file for bindgen #932

Job	Run time
clippy	8m 0s
rustfmt	22s
Test (stable)	2m 0s
Test (arm-android)	2m 3s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	1m 51s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	2m 55s
Test (arm64-android)	2m 24s
Test (i686-android)	2m 3s
Test (x86_64-android)	1m 53s
Test features	7m 12s
Test FIPS integration	2m 48s
Test (aarch64-ios)	2m 28s
Test (aarch64-ios-sim)	2m 16s
Test (x86_64-ios)	2m 15s
Test (i686-linux)	2m 15s
Test (arm-linux)	2m 14s
Test (aarch64-linux)	2m 20s
Test (arm64-macos)	2m 6s
Test (x86_64-macos)	2m 18s
Test (x86_64-mingw)	5m 54s
Test (i686-msvc)	5m 18s
Test (x86_64-msvc)	7m 47s
	1h 10m 42s

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