python-pynacl: fix build with new libsodium patch

Fixes https://github.com/openwrt/packages/issues/13016
Patch [1] broke compilation for python-pynacl.

The fix is to patch PyNaCl to consider that
PYNACL_HAS_CRYPTO_SCALARMULT_ED25519 is always available.

[1] https://github.com/openwrt/packages/commit/3ef28a4ab0cb60877c4ec68f5ba8c276021a1ab6

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/python-pynacl/patches/001-always-compile-scalar-mult-ed25519.patch

@@ -0,0 +1,13 @@
+diff --git a/src/bindings/minimal/crypto_scalarmult.h b/src/bindings/minimal/crypto_scalarmult.h
+index 06ca1ef..9bc3d8e 100644
+--- a/src/bindings/minimal/crypto_scalarmult.h
++++ b/src/bindings/minimal/crypto_scalarmult.h
+@@ -13,7 +13,7 @@
+  * limitations under the License.
+  */
+ 
+-#ifdef SODIUM_LIBRARY_MINIMAL
++#if 0
+ static const int PYNACL_HAS_CRYPTO_SCALARMULT_ED25519 = 0;
+ 
+ size_t (*crypto_scalarmult_ed25519_bytes)() = NULL;