fix build with clang6

textproc/sablotron/patches/patch-src_command_sabcmd_cpp

@@ -0,0 +1,14 @@
+$OpenBSD: patch-src_command_sabcmd_cpp,v 1.1 2018/04/10 20:56:42 naddy Exp $
+
+Index: src/command/sabcmd.cpp
+--- src/command/sabcmd.cpp.orig
++++ src/command/sabcmd.cpp
+@@ -168,7 +168,7 @@ char usage[] = 
+ 
+ char askhelp[] = "Type sabcmd --help to display a help message.\n";
+ char msgConflict[] = "conflict with preceding switches: ";
+-char version_txt[] = "\nsabcmd "SAB_VERSION" ("SAB_DATE")\n"\
++char version_txt[] = "\nsabcmd " SAB_VERSION " (" SAB_DATE ")\n"\
+     "copyright (C) 2000 - 2005 Ginger Alliance (www.gingerall.com)\n";
+ char dbg_usage[] = "\nDebugging options:\n"\
+     "\t--debug\t\t\tdisplay results of the command line parse\n"\