More fixes for 'volatile' and setjmp/longjmp.
* eval.c (Fdefvar, Fcondition_case): Remove unnecessary 'volatile's. * image.c (struct png_load_context) [HAVE_PNG]: New type. (png_load_body) [HAVE_PNG]: (jpeg_load_body) [HAVE_JPEG]: New function, with most of the old parent function's body. (png_load) [HAVE_PNG]: (jpeg_load) [HAVE_JPEG]: Invoke the new function, to avoid longjmp munging our locals. (struct my_jpeg_error_mgr) [HAVE_JPEG]: New members cinfo, failure_code. (my_error_exit) [HAVE_JPEG]: Don't trust 'setjmp' to return 2 when longjmp is passed 2, as the C standard doesn't guarantee this. Instead, store the failure code into mgr->failure_code.
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