Annotate values of PRIORITY constants

Annotate values of PRIORITY constants

g-ir-scanner incorrectly evaluates macro definition that include
references to other macro definitions. Provide a correct value as an
annotation.

Differences in generated gir files:

```diff
@@ -19017 +19017 @@
-    <constant name="PRIORITY_REDRAW" value="20" c:type="GDK_PRIORITY_REDRAW">
+    <constant name="PRIORITY_REDRAW" value="120" c:type="GDK_PRIORITY_REDRAW">
@@ -74229,3 +74229,3 @@
     </constant>
-    <constant name="PRIORITY_RESIZE" value="10" c:type="GTK_PRIORITY_RESIZE">
+    <constant name="PRIORITY_RESIZE" value="110" c:type="GTK_PRIORITY_RESIZE">
       <doc xml:space="preserve">Use this priority for functionality related to size allocation.
@@ -106786,3 +106786,3 @@
     <constant name="TEXT_VIEW_PRIORITY_VALIDATE"
-              value="5"
+              value="125"
               c:type="GTK_TEXT_VIEW_PRIORITY_VALIDATE">
```

See !472