secp256k1-sys: update patchfiles for upcoming libsecp v0.4.0 update

Update the `util.h.patch` and `secp256k1.h.patch` files in preparation for running the vendor
script. Done by guess work.

Author: tcharding

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;

secp256k1-sys/depend/util.h.patch

@@ -1,4 +1,4 @@
-134,149d133
+147,154d146
 < static SECP256K1_INLINE void *checked_malloc(const secp256k1_callback* cb, size_t size) {
 <     void *ret = malloc(size);
 <     if (ret == NULL) {
@@ -7,11 +7,3 @@
 <     return ret;
 < }
 < 
-< static SECP256K1_INLINE void *checked_realloc(const secp256k1_callback* cb, void *ptr, size_t size) {
-<     void *ret = realloc(ptr, size);
-<     if (ret == NULL) {
-<         secp256k1_callback_call(cb, "Out of memory");
-<     }
-<     return ret;
-< }
-<