Update vendored libsecp to v0.4.0

Author: tcharding

secp256k1-sys/depend/lax_der_parsing.c.patch

@@ -0,0 +1,6 @@
+10c10,12
+< 
+---
+> extern int secp256k1_ecdsa_signature_parse_compact(
+>         const secp256k1_context *ctx,
+>         secp256k1_ecdsa_signature *sig, const unsigned char *input64);

secp256k1-sys/depend/secp256k1-HEAD-revision.txt

@@ -1,2 +1,2 @@
 # This file was automatically created by vendor-libsecp.sh
-acf5c55ae6a94e5ca847e07def40427547876101
+199d27cea32203b224b208627533c2e813cd3b21

secp256k1-sys/depend/secp256k1.h.patch

@@ -1,22 +1,36 @@
-279,281d278
+236d235
+< SECP256K1_API const secp256k1_context *secp256k1_context_static;
+239,240d237
+< SECP256K1_API const secp256k1_context *secp256k1_context_no_precomp
+< SECP256K1_DEPRECATED("Use secp256k1_context_static instead");
+286,289d282
 < SECP256K1_API secp256k1_context *secp256k1_context_create(
 <     unsigned int flags
 < ) SECP256K1_WARN_UNUSED_RESULT;
-295,297d291
+< 
+302,305d294
 < SECP256K1_API secp256k1_context *secp256k1_context_clone(
 <     const secp256k1_context *ctx
 < ) SECP256K1_ARG_NONNULL(1) SECP256K1_WARN_UNUSED_RESULT;
-313,315d306
+< 
+320,323d308
 < SECP256K1_API void secp256k1_context_destroy(
 <     secp256k1_context *ctx
 < ) SECP256K1_ARG_NONNULL(1);
-395,398d385
+< 
+402,406d386
 < SECP256K1_API SECP256K1_WARN_UNUSED_RESULT secp256k1_scratch_space *secp256k1_scratch_space_create(
 <     const secp256k1_context *ctx,
 <     size_t size
 < ) SECP256K1_ARG_NONNULL(1);
-406,409d392
+< 
+413,417d392
 < SECP256K1_API void secp256k1_scratch_space_destroy(
 <     const secp256k1_context *ctx,
 <     secp256k1_scratch_space *scratch
 < ) SECP256K1_ARG_NONNULL(1);
+< 
+636d610
+< SECP256K1_API const secp256k1_nonce_function secp256k1_nonce_function_rfc6979;
+639d612
+< SECP256K1_API const secp256k1_nonce_function secp256k1_nonce_function_default;