Fix failing Windows tests

Some tests were not written to run on Windows correctly. Compile also
has a bug that caused using the --zip flag to fail on Windows.
iswspace does count the non breaking space as Whiespace on Windows but
not on Unix based systems

Bug: 117156986
Change-Id: I999375162bdfdf86fb25992ee88e2962ab90b577
Test: aapt2_tests and wine aapt2_tests.exe
diff --git a/tools/aapt2/io/ZipArchive.h b/tools/aapt2/io/ZipArchive.h
index 8381259..b283e57 100644
--- a/tools/aapt2/io/ZipArchive.h
+++ b/tools/aapt2/io/ZipArchive.h
@@ -66,6 +66,7 @@
 
   io::IFile* FindFile(const android::StringPiece& path) override;
   std::unique_ptr<IFileCollectionIterator> Iterator() override;
+  char GetDirSeparator() override;
 
   ~ZipFileCollection() override;