make mysql cdr build conditional on mysql being installed. Fixes auto build of…

make mysql cdr build conditional on mysql being installed.  Fixes auto build of mod_cdr on machines without mysql

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4132 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/event_handlers/mod_cdr/Makefile

-
-#CFLAGS  += $(shell mysql_config --include) 
 #CFLAGS  += -DSWITCH_QUEUE_ENHANCED
-#LDFLAGS += $(shell mysql_config --libs)
 #LDFLAGS += -lcurl
-
 CPPCC = g++
-OBJS=cdrcontainer.o basecdr.o baseregistry.o mysqlcdr.o pddcdr.o csvcdr.o xmlcdr.o sqlitecdr.o
+OBJS=cdrcontainer.o basecdr.o baseregistry.o pddcdr.o csvcdr.o xmlcdr.o sqlitecdr.o
+
+ifneq ($(shell which mysql_config),)
+  CFLAGS  += $(shell mysql_config --include)
+  LDFLAGS += $(shell mysql_config --libs)
+  OBJS    += mysqlcdr.o
+endif
 
 all:	depends $(OBJS) $(MODNAME).$(DYNAMIC_LIB_EXTEN)