QTest::qExtractTestData(): Set permissions of extracted files.

Currently, the files are extracted with read-only permissions.
If the data are extracted under a temporary directory, this prevents
it from being deleted, causing a leak and test failures (for example,
tst_qfileinfo).

Change-Id: Idc85f31265af234446ed21d736e9a2b9866dc62d
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

src/testlib/qtestcase.cpp

@@ -2839,6 +2839,10 @@ QString QTest::qExtractTestData(const QString &dirName)
                   qWarning("Failed to copy '%s'.", qPrintable(fileInfo.filePath()));
                   return QString();
               }
+              if (!QFile::setPermissions(destination, QFile::ReadUser | QFile::WriteUser | QFile::ReadGroup)) {
+                  qWarning("Failed to set permissions on '%s'.", qPrintable(destination));
+                  return QString();
+              }
           }
       }