Fix animation duration calculation (#19221)

zeeker999 · PatriceJiang · commit ed2eab52973e · 2018-11-30T10:56:53.000+08:00
The duration of action will be miscalculated when float abs(float)
is unavailble, replacing it with std::abs fixes the issue.
diff --git a/cocos/2d/CCActionInterval.cpp b/cocos/2d/CCActionInterval.cpp
@@ -89,7 +89,7 @@ void ExtraAction::step(float /*dt*/)
 bool ActionInterval::initWithDuration(float d)
 {
 
-    _duration = abs(d) <= MATH_EPSILON ? MATH_EPSILON : d;
+    _duration = std::abs(d) <= MATH_EPSILON ? MATH_EPSILON : d;
     _elapsed = 0;
     _firstTick = true;
     _done = false;

Original file line number	Diff line number	Diff line change
`@@ -89,7 +89,7 @@ void ExtraAction::step(float /dt/)`
`89`	`89`	`bool ActionInterval::initWithDuration(float d)`
`90`	`90`	`{`
`91`	`91`
`92`		`- _duration = abs(d) <= MATH_EPSILON ? MATH_EPSILON : d;`
	`92`	`+ _duration = std::abs(d) <= MATH_EPSILON ? MATH_EPSILON : d;`
`93`	`93`	`_elapsed = 0;`
`94`	`94`	`_firstTick = true;`
`95`	`95`	`_done = false;`