we need to build the mods w/ JS_THREADSAFE defined so it gets the header stuff right.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4159 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/languages/mod_spidermonkey/sm.mak

-CFLAGS += -I$(PREFIX)/include/js -I$(PREFIX)/include/nspr -DXP_UNIX -I../mod_spidermonkey
+CFLAGS += -I$(PREFIX)/include/js -I$(PREFIX)/include/nspr -DXP_UNIX -I../mod_spidermonkey -DJS_THREADSAFE
 LDFLAGS += -lnspr4 -ljs -lcurl