bingrep: improve test (#125477)

The test could time out due to the huge output size. Try with a simpler
binary instead.

Formula/bingrep.rb

@@ -22,6 +22,15 @@ def install
   end
 
   test do
-    system bin/"bingrep", bin/"bingrep"
+    (testpath/"test.c").write <<~EOS
+      int homebrew_test() {
+        return 0;
+      }
+      int main() {
+        return homebrew_test();
+      }
+    EOS
+    system ENV.cc, testpath/"test.c"
+    assert_match "homebrew_test", shell_output("#{bin}/bingrep a.out")
   end
 end