[SjLj] Make Wasm SjLj run with PURE_WASI #22611
                
     Merged
            
            
          
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Previously
-sPURE_WASIdisabled SjLj support because it uses the JS-based simultion, but accidentally also disabled Wasm SjLj. This makes settingPURE_WASIdisable SjLj support by default only when Wasm EH is not used. Also this does not force disabling; it only makes the default SjLj setting to be disabled, meaning you can experiment with it if you manually set-sSUPPORT_LONGJMPto be other values.Fixes #22566.