AAPT2: Add version collapsing

When an app specifies (or imports) resources with various
configurations for different SDK versions, specifying
a minSdk will make many of those resources unreachable.

Version collapsing will prune out the resources specified
for SDK versions less than the minSdk.

If, however, there is no exact matching resource for the
minSdk version, the next smallest SDK version is kept.

Change-Id: Ic7bcab6c59d65c97c67c8767358abb57cdec60a4
diff --git a/tools/aapt2/dump/Dump.cpp b/tools/aapt2/dump/Dump.cpp
index 56b9f9a..dba2d28 100644
--- a/tools/aapt2/dump/Dump.cpp
+++ b/tools/aapt2/dump/Dump.cpp
@@ -142,6 +142,10 @@
         mVerbose = val;
     }
 
+    int getMinSdkVersion() override {
+        return 0;
+    }
+
 private:
     StdErrDiagnostics mDiagnostics;
     bool mVerbose = false;