DB/Spells: Spells no longer requiring caster to be behind target

Documentation from https://wow.gamepedia.com :

- [Backstab]:
  Patch 6.0.2 (2014-10-14): Backstab can now be used on either side of the target,
  in addition to behind the target. (See also: facing requirements)

- [Garrote]:
  Patch 5.0.4 (2012-08-28): No longer requires the rogue to be behind the target.

- [Shred]:
  Patch 6.0.2 (2014-10-14): Now available for all druid specializations.
  No longer has behind enemy position requirement. Now deals 400% damage.

- [Ambush]:
  Patch 6.0.2 (2014-10-14): No longer requires the rogue to be behind the target.
  [Find Weakness] effects have been merged into baseline Ambush, [Garrote]
  and [Cheap Shot] for Subtlety rogues.

- [Gouge]:
  Legion Patch 7.0.3 (2016-07-19): Now available only to Outlaw and awards 1 combo point.
  No longer requires the target to face the rogue.
  Facing requirement need to be confirmed.

- http://www.wowhead.com/spell=1776/gouge#changelog
  "Target must be facing you." removed from the wowhead description
  in patch 7.0.1 (Fri Feb 12 2016) Build 20740

Closes #19736

1 files changed, 5 insertions, 0 deletions

diff --git a/sql/updates/world/master/2017_05_12_00_world.sql b/sql/updates/world/master/2017_05_12_00_world.sql
new file mode 100644
index 00000000000..ac0ceb19a70
--- /dev/null
+++ b/sql/updates/world/master/2017_05_12_00_world.sql
@@ -0,0 +1,5 @@
+-- Remove SPELL_ATTR0_CU_REQ_CASTER_BEHIND_TARGET from Backstab (53), Garrote (703), Shred (5221), Ambush (8676)
+DELETE FROM `spell_custom_attr` WHERE `entry` IN (53, 703, 5221, 8676);
+
+-- Remove SPELL_ATTR0_CU_REQ_TARGET_FACING_CASTER from Gouge (1776)
+DELETE FROM `spell_custom_attr` WHERE `entry` = 1776;