Lua: Use Redis solaris compatability for cjson too

cjson calls isinf, but some Solaris versions don't have isinf
even with the attempted fix we have in deps/Makefile.

We can harmlessly include the Redis solarisfixes.h header to
give cjson proper isinf.

Note: cjson has a compile-time setting for using their own defined
isinf, but the Redis definition in solarisfixes.h is more complete.

Fixes antirez#1620

deps/lua/src/lua_cjson.c

@@ -46,6 +46,8 @@
 #include "strbuf.h"
 #include "fpconv.h"
 
+#include "../../../src/solarisfixes.h"
+
 #ifndef CJSON_MODNAME
 #define CJSON_MODNAME   "cjson"
 #endif