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Duktape V1 compatibility helpers
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Provides helpers for migrating from Duktape 1.x to 2.x:
* Add ``duk_v1_compat.c`` to list of C sources to compile.
* Ensure ``duk_v1_compat.h`` is in the include path.
* Include the extra header in calling code::
#include "duktape.h"
#include "duk_v1_compat.h"
/* ... */
duk_dump_context_stdout(ctx); /* Removed in Duktape 2.x. */
The helpers don't restore full 1.x compatibility because some API calls such
as ``duk_safe_call()`` have changed in an incompatible manner.
The old APIs are documented in:
* http://duktape.org/1.5.0/api.html
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