Fix MSVC++ compile error due to non-const array dimension values.

src/FileOps.cpp

@@ -92,7 +92,7 @@ void FileOps::extractFromZip(const char* zipFilePath, const char* src, const cha
 	{
 		// found a match which is now the current file
 		unzOpenCurrentFile(zipFile);
-		int chunkSize = 4096;
+		const int chunkSize = 4096;
 		char buffer[chunkSize];
 
 		std::ofstream outputFile(dest,std::ofstream::binary);

src/tests/TestUpdaterOptions.cpp

@@ -5,7 +5,7 @@
 
 void TestUpdaterOptions::testOldFormatArgs()
 {
-	int argc = 6;
+	const int argc = 6;
 	char* argv[argc];
 	argv[0] = "updater";
 	argv[1] = "CurrentDir=/path/to/app";