Fix qtypes' licenses

- Change from GPL to LGPL
- Add license text when missing
- Minor cosmetic changes to make all headers look the same

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/check-qint.c b/check-qint.c
index 49887bb..f3b0316 100644
--- a/check-qint.c
+++ b/check-qint.c
@@ -5,6 +5,9 @@
  *
  * Authors:
  *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
  */
 #include <check.h>