contrib: secp256k1 no longer has a --disable-jni option

It was removed in https://github.com/bitcoin-core/secp256k1/pull/682

contrib/make_libsecp256k1.sh

@@ -49,7 +49,6 @@ info "Building $pkgname..."
             --enable-module-recovery \
             --enable-experimental \
             --enable-module-ecdh \
-            --disable-jni \
             --disable-tests \
             --disable-static \
             --enable-shared || fail "Could not configure $pkgname. Please make sure you have a C compiler installed and try again."