Remove always debug mode

This is checked automatically using the DEBUG env variable

Author: elichai

build.rs

@@ -45,7 +45,6 @@ fn main() {
     base_config.include("depend/secp256k1/")
                .include("depend/secp256k1/include")
                .include("depend/secp256k1/src")
-               .debug(true)
                .flag_if_supported("-Wno-unused-function") // some ecmult stuff is defined but not used upstream
                .define("SECP256K1_BUILD", Some("1"))
                // TODO these three should be changed to use libgmp, at least until secp PR 290 is merged