Fix const declaration mismatch and double/float mix

Summary:
This PR fixes a declaration mismatch for `YGNodeCanUseCachedMeasurement` where the last argument is declared non `const` in `.h` and `const` in `.c`.

Additionally it uses explicit `float` for fraction calculation do avoid usage of `double` assignment.
Closes https://github.com/facebook/yoga/pull/607

Differential Revision: D5677931

Pulled By: emilsjolander

fbshipit-source-id: 502da957089e4439ed956987ff8dec10bd033ba3

yoga/Yoga.h

@@ -112,7 +112,7 @@ WIN_EXPORT bool YGNodeCanUseCachedMeasurement(const YGMeasureMode widthMode,
                                               const float lastComputedHeight,
                                               const float marginRow,
                                               const float marginColumn,
-                                              YGConfigRef config);
+                                              const YGConfigRef config);
 
 WIN_EXPORT void YGNodeCopyStyle(const YGNodeRef dstNode, const YGNodeRef srcNode);