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js: Add modern "key" values for Delete and arrow keys

Firefox has emitted "Delete", "ArrowDown" etc since 2015.

--- a/emcc.c

+++ b/emcc.c

@@ -267,17 +267,18 @@

 {

     int keyevent = -1;

-    if (!strnullcmp(key, "Backspace") || !strnullcmp(key, "Del"))

+    if (!strnullcmp(key, "Backspace") || !strnullcmp(key, "Delete") ||

+        !strnullcmp(key, "Del"))

         keyevent = 127;                /* Backspace / Delete */

     else if (!strnullcmp(key, "Enter"))

         keyevent = 13;             /* return */

-    else if (!strnullcmp(key, "Left"))

+    else if (!strnullcmp(key, "ArrowLeft") || !strnullcmp(key, "Left"))

         keyevent = CURSOR_LEFT;

-    else if (!strnullcmp(key, "Up"))

+    else if (!strnullcmp(key, "ArrowUp") || !strnullcmp(key, "Up"))

         keyevent = CURSOR_UP;

-    else if (!strnullcmp(key, "Right"))

+    else if (!strnullcmp(key, "ArrowRight") || !strnullcmp(key, "Right"))

         keyevent = CURSOR_RIGHT;

-    else if (!strnullcmp(key, "Down"))

+    else if (!strnullcmp(key, "ArrowDown") || !strnullcmp(key, "Down"))

         keyevent = CURSOR_DOWN;

     else if (!strnullcmp(key, "End"))

         /*