native frameworks: 64-bit compile issues

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

Change-Id: I05c7724d2aba6da1e82a86000e11f3a8fef4e728
diff --git a/cmds/installd/utils.c b/cmds/installd/utils.c
index 0642330..8f4da65 100644
--- a/cmds/installd/utils.c
+++ b/cmds/installd/utils.c
@@ -435,7 +435,7 @@
 {
     cache->numCollected++;
     if ((cache->numCollected%20000) == 0) {
-        ALOGI("Collected cache so far: %d directories, %d files",
+        ALOGI("Collected cache so far: %zd directories, %zd files",
             cache->numDirs, cache->numFiles);
     }
 }
@@ -730,7 +730,7 @@
     int skip = 0;
     char path[PATH_MAX];
 
-    ALOGI("Collected cache files: %d directories, %d files",
+    ALOGI("Collected cache files: %zd directories, %zd files",
         cache->numDirs, cache->numFiles);
 
     CACHE_NOISY(ALOGI("Sorting files..."));