libssh2: restore accidentally removed patch

commit 130624690f did it.

src/libssh2-1-fixes.patch

@@ -0,0 +1,24 @@
+This file is part of MXE. See LICENSE.md for licensing information.
+
+From a1d0ed70e2c94d89d0b598eacca6ac79b8cd5508 Mon Sep 17 00:00:00 2001
+From: Mark Brand <mabrand@mabrand.nl>
+Date: Sun, 2 Sep 2012 00:55:28 +0200
+Subject: [PATCH] include gpg-error with gcrypt for static linking
+ (mxe-specific)
+
+
+diff --git a/configure.ac b/configure.ac
+index 563fb04..16caa88 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -124,6 +124,7 @@ if test "$ac_cv_libgcrypt" = "yes"; then
+   AC_DEFINE(LIBSSH2_LIBGCRYPT, 1, [Use libgcrypt])
+   LIBSREQUIRED= # libgcrypt doesn't provide a .pc file. sad face.
+   LIBS="$LIBS -lgcrypt"
++  LIBS="$LIBS `${prefix}/bin/gpg-error-config --libs`"
+   found_crypto=libgcrypt
+ fi
+ AM_CONDITIONAL(LIBGCRYPT, test "$ac_cv_libgcrypt" = "yes")
+-- 
+2.1.0
+