wally_script: expose varbuff_to_bytes in core api

Author: benma

include/wally_script.h

@@ -422,6 +422,11 @@ WALLY_CORE_API int wally_witness_program_from_bytes(
     size_t len,
     size_t *written);
 
+WALLY_CORE_API size_t wally_varbuff_to_bytes(
+    const unsigned char *bytes,
+    size_t bytes_len,
+    unsigned char *bytes_out);
+
 #ifdef BUILD_ELEMENTS
 /**
  * Create a pegout script.
@@ -481,4 +486,3 @@ WALLY_CORE_API int wally_elements_pegin_contract_script_from_bytes(
 #endif
 
 #endif /* LIBWALLY_CORE_SCRIPT_H */
-

src/script.c

@@ -283,6 +283,12 @@ size_t varbuff_to_bytes(const unsigned char *bytes, size_t bytes_len,
     return n + bytes_len;
 }
 
+size_t wally_varbuff_to_bytes(const unsigned char *bytes, size_t bytes_len,
+                              unsigned char *bytes_out)
+{
+    return varbuff_to_bytes(bytes, bytes_len, bytes_out);
+}
+
 size_t confidential_value_to_bytes(const unsigned char *bytes, size_t bytes_len,
                                    unsigned char *bytes_out)
 {