Fix long paths on Windows

util::mkdirs iteratively creates each directory of a specified path. For
windows, Calling mkdir on only the drive letter or on the extended path
prefix (\?\\) will result in an error. Start after the long path prefix
and the drive letter.

This also changes AAPT2 to use AssetMaanager2 to retrieve symbols from
the symbol table. AssetManager2's zip library uses _wopen to open
windows files.

Bug:123251200
Test: aapt2_tests.exe
Change-Id: I26169d83b22d441485de3c49d63a6c4ed710e292
diff --git a/core/jni/android_util_AssetManager.cpp b/core/jni/android_util_AssetManager.cpp
index a212f47..af2d413 100644
--- a/core/jni/android_util_AssetManager.cpp
+++ b/core/jni/android_util_AssetManager.cpp
@@ -343,7 +343,9 @@
   assetmanager->ForEachPackage([&](const std::string& this_package_name, uint8_t package_id) {
     if (this_package_name == std_package_name) {
       map = assetmanager->GetOverlayableMapForPackage(package_id);
+      return false;
     }
+    return true;
   });
 
   if (map == nullptr) {
@@ -521,15 +523,16 @@
     return nullptr;
   }
 
-  assetmanager->ForEachPackage([&](const std::string& package_name, uint8_t package_id) {
+  assetmanager->ForEachPackage([&](const std::string& package_name, uint8_t package_id) -> bool {
     jstring jpackage_name = env->NewStringUTF(package_name.c_str());
     if (jpackage_name == nullptr) {
       // An exception is pending.
-      return;
+      return false;
     }
 
     env->CallVoidMethod(sparse_array, gSparseArrayOffsets.put, static_cast<jint>(package_id),
                         jpackage_name);
+    return true;
   });
   return sparse_array;
 }