fix(@angular/build): skip normalization of relative externals

Author: dmitry-stepanenko

packages/angular/build/src/builders/application/options.ts

@@ -707,7 +707,15 @@ function normalizeExternals(value: string[] | undefined): string[] | undefined {
     return undefined;
   }
 
-  return [...new Set(value.map((d) => (d.endsWith('/*') ? d.slice(0, -2) : d)))];
+  return [...new Set(value.map((d) => {
+    if (d.endsWith('/*')) {
+      const isPackageName = !d.startsWith('/') && !d.startsWith('./') && !d.startsWith('../');
+      if (isPackageName) {
+        return  d.slice(0, -2);
+      }
+    }
+    return d;
+}))];
 }
 
 async function findFrameworkVersion(projectRoot: string): Promise<string> {