Use STL containers

Bug: chromium:1266412
Change-Id: I623aca58d5073fd9f31f7535a4014d41c7f64db5
diff --git a/BUILD.gn b/BUILD.gn
index 00396e8..97aab3a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -30,6 +30,7 @@
   defines = [
     "VMA_DYNAMIC_VULKAN_FUNCTIONS=0",
     "VMA_STATIC_VULKAN_FUNCTIONS=0",
+    "VMA_USE_STL_CONTAINERS=1",
   ]
 }