Merge #536: secp256k1-sys: Remove unused flags in build.rs

7d3dc35 secp256k1-sys: Remove unused flags in build.rs (Elichai Turkel)

Pull request description:

  These are no longer used in upstream, so there's no reason for us to set them

ACKs for top commit:
  apoelstra:
    ACK 7d3dc35

Tree-SHA512: 79ecbed19ba9eb61640306bc5413b139e902ee84b7e122e8ae57e451f2b132371440554f21ed075ed34d9d702c4316e4b170ca638c774532ecf5a11456b4e2ad

Author: apoelstra

secp256k1-sys/build.rs

@@ -35,11 +35,7 @@ fn main() {
                .define("SECP256K1_API", Some(""))
                .define("ENABLE_MODULE_ECDH", Some("1"))
                .define("ENABLE_MODULE_SCHNORRSIG", Some("1"))
-               .define("ENABLE_MODULE_EXTRAKEYS", Some("1"))
-               // TODO these three should be changed to use libgmp, at least until secp PR 290 is merged
-               .define("USE_NUM_NONE", Some("1"))
-               .define("USE_FIELD_INV_BUILTIN", Some("1"))
-               .define("USE_SCALAR_INV_BUILTIN", Some("1"));
+               .define("ENABLE_MODULE_EXTRAKEYS", Some("1"));
 
     if cfg!(feature = "lowmemory") {
         base_config.define("ECMULT_WINDOW_SIZE", Some("4")); // A low-enough value to consume negligible memory