Add the conceal patch from Vince Negri.
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index f41e0f4..4e0e169 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -677,6 +677,8 @@
 			EXTRA|TRLBAR|NOTRLCOM|USECTRLV|CMDWIN),
 EX(CMD_ounmenu,		"ounmenu",	ex_menu,
 			EXTRA|TRLBAR|NOTRLCOM|USECTRLV|CMDWIN),
+EX(CMD_ownsyntax,	"ownsyntax",	ex_ownsyntax,
+			EXTRA|NOTRLCOM|SBOXOK|CMDWIN),
 EX(CMD_print,		"print",	ex_print,
 			RANGE|WHOLEFOLD|COUNT|EXFLAGS|TRLBAR|CMDWIN|SBOXOK),
 EX(CMD_pclose,		"pclose",	ex_pclose,