native frameworks: 64-bit compile issues

- Fix format (print/scanf)
- Suppress unused argument warning messages (bonus)

Change-Id: I05c7724d2aba6da1e82a86000e11f3a8fef4e728
diff --git a/cmds/flatland/Main.cpp b/cmds/flatland/Main.cpp
index d6ac3d2..c0e5b3d 100644
--- a/cmds/flatland/Main.cpp
+++ b/cmds/flatland/Main.cpp
@@ -600,7 +600,7 @@
 
     uint32_t runHeight = b.runHeights[run];
     uint32_t runWidth = b.width * runHeight / b.height;
-    printf(" %-*s | %4d x %4d | ", g_BenchmarkNameLen, b.name,
+    printf(" %-*s | %4d x %4d | ", static_cast<int>(g_BenchmarkNameLen), b.name,
             runWidth, runHeight);
     fflush(stdout);
 
@@ -690,8 +690,9 @@
     size_t len = strlen(scenario);
     size_t leftPad = (g_BenchmarkNameLen - len) / 2;
     size_t rightPad = g_BenchmarkNameLen - len - leftPad;
-    printf(" %*s%s%*s | Resolution  | Time (ms)\n", leftPad, "",
-            "Scenario", rightPad, "");
+    printf(" %*s%s%*s | Resolution  | Time (ms)\n",
+            static_cast<int>(leftPad), "",
+            "Scenario", static_cast<int>(rightPad), "");
 }
 
 // Run ALL the benchmarks!