Normative: Delete superfluous era aliases to align with CLDR

Author: sffc

spec.emu

@@ -274,7 +274,7 @@ contributors: Google, Ecma International
           <tr>
             <td>*"ethioaa"*</td>
             <td>*"aa"*</td>
-            <td>*"mundi"*</td>
+            <td></td>
             <td>-∞</td>
             <td>+∞</td>
             <td>~epoch~</td>
@@ -283,7 +283,7 @@ contributors: Google, Ecma International
           <tr>
             <td>*"ethiopic"*</td>
             <td>*"am"*</td>
-            <td>*"incar"*</td>
+            <td></td>
             <td>1</td>
             <td>+∞</td>
             <td>~epoch~</td>
@@ -463,7 +463,7 @@ contributors: Google, Ecma International
           <tr>
             <td>*"roc"*</td>
             <td>*"roc"*</td>
-            <td>*"minguo"*</td>
+            <td></td>
             <td>1</td>
             <td>+∞</td>
             <td>~epoch~</td>
@@ -472,7 +472,7 @@ contributors: Google, Ecma International
           <tr>
             <td>*"roc"*</td>
             <td>*"broc"*</td>
-            <td>*"before-roc"*, *"minguo-qian"*</td>
+            <td></td>
             <td>1</td>
             <td>+∞</td>
             <td>~negative~</td>