add --disbale-cpp configure argument to disable the c++ build for the core

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15717 d0543943-73ff-0310-b7d9-9358b9ac24b2

Makefile.am

@@ -107,7 +107,6 @@ src/switch_config.c\
 src/switch_time.c\
 src/switch_odbc.c \
 libs/stfu/stfu.c\
-src/switch_cpp.cpp\
 src/g711.c\
 src/switch_pcm.c\
 libs/libteletone/src/libteletone_detect.c\
@@ -124,6 +123,10 @@ libs/miniupnpc/upnperrors.c \
 libs/libnatpmp/natpmp.c \
 libs/libnatpmp/getgateway.c
 
+if ENABLE_CPP
+libfreeswitch_la_SOURCES += src/switch_cpp.cpp
+endif
+
 library_includedir      = $(PREFIX)/include
 
 library_include_HEADERS = \