Merge rust-bitcoin/rust-secp256k1#764: Update the `secp256k1-sys` cod… #1530

Job	Run time
Prepare	3s
Docs - stable toolchain (recent)	12s
Test - 1.63.0 toolchain (minimal)	5m 41s
Test 32-bit version	26s
Test - 1.63.0 toolchain (recent)	5m 50s
Format - nightly toolchain	16s
Test - stable toolchain (minimal)	3m 9s
WASM - stable toolchain	1m 54s
Test - stable toolchain (recent)	3m 50s
Lint - nightly toolchain (recent)	25s
Test - nightly toolchain (minimal)	2m 31s
Bench - nightly toolchain (recent)	23s
Test - nightly toolchain (recent)	2m 33s
ASAN - nightly toolchain (recent)	1m 24s
Docs - nightly toolchain (recent)	22s
no-std - nightly toolchain (recent)	44s
	29m 43s

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