Merge #272: surjectionproof: remove unused include

fcc0299 surjectionproof: remove unused include (Jon Griffiths)

Pull request description:

ACKs for top commit:
  delta1:
    ACK fcc0299
  jonasnick:
    ACK fcc0299

Tree-SHA512: dbd5dd982796b99871f2fbd3ab8404c6817bd4970d8775a83bd3a3fd916a683ff9da70c334a377870063eaa5c8cfb73481edfdd0bd7279fc7dc7f8b5368bb5aa

Author: jonasnick

src/modules/surjection/main_impl.h

@@ -9,10 +9,6 @@
 #include <assert.h>
 #include <string.h>
 
-#if defined HAVE_CONFIG_H
-#include "../../libsecp256k1-config.h"
-#endif
-
 #include "../../../include/secp256k1_rangeproof.h"
 #include "../../../include/secp256k1_surjectionproof.h"
 #include "../rangeproof/borromean.h"