Fix build for DragonFlyBSD dirent(3) that does not have a dirent.d_reclen entry.

Index: distinfo
===================================================================
RCS file: /cvsroot/pkgsrc/textproc/the_silver_searcher/distinfo,v
retrieving revision 1.12
diff -u -p -r1.12 distinfo
--- distinfo	1 Dec 2016 09:28:34 -0000	1.12
+++ distinfo	1 Dec 2016 10:14:38 -0000
@@ -4,3 +4,4 @@ SHA1 (the_silver_searcher-1.0.1.tar.gz) 
 RMD160 (the_silver_searcher-1.0.1.tar.gz) = 2e4b3dfa430b3036a9dfffe11f60e4c50ec1486d
 SHA512 (the_silver_searcher-1.0.1.tar.gz) = f8c86a6eb5017fac61d0ff6726d10b1eff0cd75ad0fee99f9d17f35ad3cad80aceb2101a5caa26f2cacbd8618b60af005966bf2c39bd1f0fc52d6fafb5eed778
 Size (the_silver_searcher-1.0.1.tar.gz) = 183173 bytes
+SHA1 (patch-src_scandir.c) = 41c0af602ef478db39bd48315b0fb1a644a9db91
Index: patches/patch-src_scandir.c
===================================================================
RCS file: patches/patch-src_scandir.c
diff -N patches/patch-src_scandir.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-src_scandir.c	1 Dec 2016 10:14:38 -0000
@@ -0,0 +1,24 @@
+$NetBSD$
+
+DragonFlyBSD dirent(3) does not have dirent.d_reclen entry.
+
+--- src/scandir.c.orig	2016-05-10 17:39:42.000000000 +0000
++++ src/scandir.c
+@@ -38,7 +38,7 @@ int ag_scandir(const char *dirname,
+             }
+         }
+ 
+-#if defined(__MINGW32__) || defined(__CYGWIN__)
++#if defined(__MINGW32__) || defined(__CYGWIN__) || defined(__DragonFly__)
+         d = malloc(sizeof(struct dirent));
+ #else
+         d = malloc(entry->d_reclen);
+@@ -47,7 +47,7 @@ int ag_scandir(const char *dirname,
+         if (d == NULL) {
+             goto fail;
+         }
+-#if defined(__MINGW32__) || defined(__CYGWIN__)
++#if defined(__MINGW32__) || defined(__CYGWIN__) || defined(__DragonFly__)
+         memcpy(d, entry, sizeof(struct dirent));
+ #else
+         memcpy(d, entry, entry->d_reclen);