Frameworks/base: Fix AAPT warnings

Turn on -Wall -Werror. Fix warnings.

Change-Id: I287fb3c1e851c654479bcf9ea8c73bd354a6b2a1
diff --git a/tools/aapt/CrunchCache.cpp b/tools/aapt/CrunchCache.cpp
index c4cf6bc..6c39d1d 100644
--- a/tools/aapt/CrunchCache.cpp
+++ b/tools/aapt/CrunchCache.cpp
@@ -101,4 +101,4 @@
     time_t sourceDate = mSourceFiles.valueFor(mSourcePath.appendPathCopy(relativePath));
     time_t destDate = mDestFiles.valueFor(mDestPath.appendPathCopy(relativePath));
     return sourceDate > destDate;
-}
\ No newline at end of file
+}