Use the setcap target for Linux builds of src/sbbs3 to automatically

set the capabilities of sbbs (enable low-port binding)

install/GNUmakefile

@@ -148,7 +148,11 @@ binaries:	sbbs3 gtkuseredit gtkchat gtkmonitor gtkuserlist syncview sexpots
 externals:	sbj dpoker tbd
 
 sbbs3:	src $(SBBSDIR)/3rdp/dist
+ifeq ($(os),linux)
+	$(MAKE) -C $(SBBSDIR)/src/sbbs3 $(MKFLAGS) setcap
+else
 	$(MAKE) -C $(SBBSDIR)/src/sbbs3 $(MKFLAGS)
+endif
 
 sexpots:	src
 	$(MAKE) -C $(SBBSDIR)/src/sexpots $(MKFLAGS)