FS-2936: link curl on freeswitch binary as well to fix linker error on ubuntu

Makefile.am

@@ -344,6 +344,10 @@ freeswitch_CFLAGS  = $(AM_CFLAGS) $(CORE_CFLAGS)
 freeswitch_LDFLAGS = $(AM_LDFLAGS) -lpthread -rpath $(libdir)
 freeswitch_LDADD   = libfreeswitch.la libs/apr/libapr-1.la
 
+if CURL_BUILTIN
+freeswitch_LDFLAGS += libs/curl/lib/libcurl.la
+endif
+
 if HAVE_LIBEDIT
 freeswitch_CFLAGS += -Ilibs/libedit/src -DSWITCH_HAVE_LIBEDIT
 freeswitch_LDADD  += libs/libedit/src/.libs/libedit.a