clutter: Remove all the since annotations

Since they are all refer to the days clutter used to be a separate
library

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2441>

clutter/clutter/clutter-align-constraint.c

@@ -30,8 +30,6 @@
  * #ClutterAlignConstraint is a [class@Constraint] that aligns the position
  * of the [class@Actor] to which it is applied to the size of another
  * [class@Actor] using an alignment factor
- *
- * Since: 1.4
  */
 
 #include "clutter-build-config.h"
@@ -289,8 +287,6 @@ clutter_align_constraint_class_init (ClutterAlignConstraintClass *klass)
    *
    * The #ClutterActor must not be a child or a grandchild of the actor
    * using the constraint.
-   *
-   * Since: 1.4
    */
   obj_props[PROP_SOURCE] =
     g_param_spec_object ("source",
@@ -303,8 +299,6 @@ clutter_align_constraint_class_init (ClutterAlignConstraintClass *klass)
    * ClutterAlignConstraint:align-axis:
    *
    * The axis to be used to compute the alignment
-   *
-   * Since: 1.4
    */
   obj_props[PROP_ALIGN_AXIS] =
     g_param_spec_enum ("align-axis",
@@ -347,8 +341,6 @@ clutter_align_constraint_class_init (ClutterAlignConstraintClass *klass)
    * with an align-axis value of %CLUTTER_ALIGN_X_AXIS, 0.0 means left and
    * 1.0 means right; with a value of %CLUTTER_ALIGN_Y_AXIS, 0.0 means top
    * and 1.0 means bottom.
-   *
-   * Since: 1.4
    */
   obj_props[PROP_FACTOR] =
     g_param_spec_float ("factor",
@@ -387,8 +379,6 @@ clutter_align_constraint_init (ClutterAlignConstraint *self)
  * alignment @factor
  *
  * Return value: the newly created #ClutterAlignConstraint
- *
- * Since: 1.4
  */
 ClutterConstraint *
 clutter_align_constraint_new (ClutterActor     *source,
@@ -410,8 +400,6 @@ clutter_align_constraint_new (ClutterActor     *source,
  * @source: (allow-none): a #ClutterActor, or %NULL to unset the source
  *
  * Sets the source of the alignment constraint
- *
- * Since: 1.4
  */
 void
 clutter_align_constraint_set_source (ClutterAlignConstraint *align,
@@ -478,8 +466,6 @@ clutter_align_constraint_set_source (ClutterAlignConstraint *align,
  *
  * Return value: (transfer none): the #ClutterActor used as the source
  *   of the alignment
- *
- * Since: 1.4
  */
 ClutterActor *
 clutter_align_constraint_get_source (ClutterAlignConstraint *align)
@@ -495,8 +481,6 @@ clutter_align_constraint_get_source (ClutterAlignConstraint *align)
  * @axis: the axis to which the alignment refers to
  *
  * Sets the axis to which the alignment refers to
- *
- * Since: 1.4
  */
 void
 clutter_align_constraint_set_align_axis (ClutterAlignConstraint *align,
@@ -522,8 +506,6 @@ clutter_align_constraint_set_align_axis (ClutterAlignConstraint *align,
  * Retrieves the value set using clutter_align_constraint_set_align_axis()
  *
  * Return value: the alignment axis
- *
- * Since: 1.4
  */
 ClutterAlignAxis
 clutter_align_constraint_get_align_axis (ClutterAlignConstraint *align)
@@ -604,8 +586,6 @@ clutter_align_constraint_get_pivot_point (ClutterAlignConstraint *align,
  * meaning bottom, when #ClutterAlignConstraint:align-axis is set to
  * %CLUTTER_ALIGN_Y_AXIS). A value of 0.5 aligns in the middle in either
  * cases
- *
- * Since: 1.4
  */
 void
 clutter_align_constraint_set_factor (ClutterAlignConstraint *align,
@@ -628,8 +608,6 @@ clutter_align_constraint_set_factor (ClutterAlignConstraint *align,
  * Retrieves the factor set using clutter_align_constraint_set_factor()
  *
  * Return value: the alignment factor
- *
- * Since: 1.4
  */
 gfloat
 clutter_align_constraint_get_factor (ClutterAlignConstraint *align)