Add errata supporting changes to position: static (#1434)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1434

X-link: https://github.com/facebook/react-native/pull/41130

I will use this errata to gate my changes that actually make position: static behave like the web. We have future plans to make position: relative the default again but users could still have declared certain nodes as position: static, so I think this is needed regardless.

Reviewed By: NickGerleman

Differential Revision: D50506915

fbshipit-source-id: b0d9e6883167de6ff002352c9288053324464cb9

yoga/YGEnums.cpp

@@ -97,6 +97,8 @@ const char* YGErrataToString(const YGErrata value) {
       return "stretch-flex-basis";
     case YGErrataStartingEndingEdgeFromFlexDirection:
       return "starting-ending-edge-from-flex-direction";
+    case YGErrataPositionStaticBehavesLikeRelative:
+      return "position-static-behaves-like-relative";
     case YGErrataAll:
       return "all";
     case YGErrataClassic: