Change Details

``` Also remove CPPFLAGS=-DVALGRIND because that's redundant with when configured with --enable-valgrind. ``` Backport of secp256k1 PR821.

``` Also remove CPPFLAGS=-DVALGRIND because that's redundant with when configured with --enable-valgrind. ``` Backport of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/821 | PR821]].

``` Also remove CPPFLAGS=-DVALGRIND because that's redundant with when configured with --enable-valgrind. ``` Backport of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/821 | PR821]].