always set up eofCode and eofThrow

Commit 3e570d9 introduced a separation between scanner.eofCode
and Emitter eofCode, but transferred the information only when
%eofclose was present.

Fixes #743

jflex/src/main/java/jflex/generator/Emitter.java

@@ -1284,6 +1284,9 @@ private void setupEOFCode() {
     if (scanner.eofclose()) {
       eofCode = LexScan.conc(scanner.eofCode(), "  yyclose();");
       eofThrow = LexScan.concExc(scanner.eofThrow(), "java.io.IOException");
+    } else {
+      eofCode = scanner.eofCode();
+      eofThrow = scanner.eofThrow();
     }
   }