Allow unnecessary parentheses

Clippy emits:

	warning: unnecessary parentheses around assigned value

Add a attribute to allow unnecessary parentheses.

Author: tcharding

secp256k1-sys/src/lib.rs

@@ -43,6 +43,7 @@ pub const SECP256K1_START_VERIFY: c_uint = 1 | (1 << 8);
 /// Flag for context to enable signing precomputation
 pub const SECP256K1_START_SIGN: c_uint = 1 | (1 << 9);
 /// Flag for keys to indicate uncompressed serialization format
+#[allow(unused_parens)]
 pub const SECP256K1_SER_UNCOMPRESSED: c_uint = (1 << 1);
 /// Flag for keys to indicate compressed serialization format
 pub const SECP256K1_SER_COMPRESSED: c_uint = (1 << 1) | (1 << 8);