dtlogin: openbsd build fix

Amend ced27aa1f69a7c41bdf67f8d39f786899947aa26 to prevent openbsd
make from failing because of the tab.

cde/programs/dtlogin/Imakefile

@@ -243,7 +243,7 @@ INCLUDES = -I$(XPROJECTROOT)/include/freetype2
 #elif defined (LinuxArchitecture)
 	 DEFINES = $(DTDEFINES) -DXDMCP
 #elif defined (OpenBSDArchitecture)
-	DEFINES = $(DTDEFINES) -DXDMCP
+        DEFINES = $(DTDEFINES) -DXDMCP
 #elif defined (FreeBSDArchitecture)
 	DEFINES = $(DTDEFINES) -DXDMCP
 #else