fix FTBFS, c++ linking needs -lstdc++ explicitly
https://bugzilla.redhat.com/show_bug.cgi?id=631288

diff -up apcupsd-3.14.8/src/Makefile.cxxld apcupsd-3.14.8/src/Makefile
--- apcupsd-3.14.8/src/Makefile.cxxld	2009-09-30 01:20:45.000000000 +0200
+++ apcupsd-3.14.8/src/Makefile	2010-09-22 11:18:03.550601657 +0200
@@ -26,10 +26,10 @@ SRCS = $(common_srcs) $(apcupsd_srcs) $(
 all-targets: apcupsd apcaccess apctest smtp 
 
 apcupsd: $(common_obj) $(apcupsd_obj) $(APCDRVLIBS) $(APCLIBS)
-	$(LINK) $(DRVLIBS)
+	$(LINK) -lstdc++ $(DRVLIBS)
 
 apctest: $(common_obj) $(apctest_obj) $(APCDRVLIBS) $(APCLIBS)
-	$(LINK) $(DRVLIBS)
+	$(LINK) -lstdc++ $(DRVLIBS)
 
 apcaccess: $(apcaccess_obj) $(APCLIBS)
 	$(LINK)