net-p2p/litecoin: fix build on big-endian architectures

Include sys/endian.h in src/crypto/scrypt.cpp, big-endian architectures need it:
crypto/scrypt.cpp:157:3: error: 'be32enc' was not declared in this scope
  157 |   be32enc(ivec, (uint32_t)(i + 1));
      |   ^~~~~~~
crypto/scrypt.cpp: In function 'void scrypt_1024_1_1_256_sp_generic(const char*, char*, char*)':
crypto/scrypt.cpp:269:10: error: 'le32dec' was not declared in this scope
  269 |   X[k] = le32dec(&B[4 * k]);
      |          ^~~~~~~
crypto/scrypt.cpp:285:3: error: 'le32enc' was not declared in this scope
  285 |   le32enc(&B[4 * k], X[k]);
      |   ^~~~~~~

PR:		240695
Approved by:	hsw@bitmark.com (maintainer), linimon (mentor)

1 files changed, 11 insertions, 0 deletions

diff --git a/net-p2p/litecoin/files/patch-src_crypto_scrypt.cpp b/net-p2p/litecoin/files/patch-src_crypto_scrypt.cpp
new file mode 100644
index 000000000000..ca54cf1dd175
--- /dev/null
+++ b/net-p2p/litecoin/files/patch-src_crypto_scrypt.cpp
@@ -0,0 +1,11 @@
+--- src/crypto/scrypt.cpp.orig	2019-09-19 19:04:21 UTC
++++ src/crypto/scrypt.cpp
+@@ -60,6 +60,8 @@ static inline void be32enc(void *pp, uint32_t x)
+ 	p[0] = (x >> 24) & 0xff;
+ }
+ 
++#else
++#include <sys/endian.h>
+ #endif
+ typedef struct HMAC_SHA256Context {
+ 	SHA256_CTX ictx;