Add deep C stack for dukweb.js

By default dukweb.js gets a shallow stack intended for embedded
environments.  This results in C recursion limits being hit for
large expression that work fine on the command line, see e.g.
GH-67.

Makefile

@@ -559,7 +559,7 @@ emscriptenduktest: emscripten dist
 # and providing an eval() facility from both sides.  This is a placeholder now
 # and doesn't do anything useful yet.
 EMCCOPTS_DUKWEB_EXPORT=-s EXPORTED_FUNCTIONS='["_dukweb_is_open", "_dukweb_open","_dukweb_close","_dukweb_eval"]'
-EMCCOPTS_DUKWEB_DEFINES=-DDUK_OPT_ASSERTIONS -DDUK_OPT_SELF_TESTS '-DDUK_OPT_DECLARE=extern void dukweb_panic_handler(int code, const char *msg);' '-DDUK_OPT_PANIC_HANDLER(code,msg)={dukweb_panic_handler((code),(msg));abort();}' 
+EMCCOPTS_DUKWEB_DEFINES=-DDUK_OPT_ASSERTIONS -DDUK_OPT_SELF_TESTS -DDUK_OPT_DEEP_C_STACK '-DDUK_OPT_DECLARE=extern void dukweb_panic_handler(int code, const char *msg);' '-DDUK_OPT_PANIC_HANDLER(code,msg)={dukweb_panic_handler((code),(msg));abort();}' 
 
 # FIXME: need to be able to declare dukweb_panic_handler to avoid warnings
 dukweb.js: emscripten dist

RELEASES.rst

@@ -623,6 +623,9 @@ Planned
   previously fileName would always be duk_bi_global.c which is misleading
   (see GH-58)
 
+* Use deep C stack for dukweb.js to remove some compiler recursion limit
+  limitations (see GH-67)
+
 1.2.0 (2015-XX-XX)
 ------------------