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Make the round() replacement match C99 and POSIX.

http://pubs.opengroup.org/onlinepubs/009695399/functions/round.html

Change-Id: Idf387d944d36bf593f8797db9053e11e5c9b9b39

--- a/vp9/common/vp9_systemdependent.h

+++ b/vp9/common/vp9_systemdependent.h

@@ -35,11 +35,11 @@

 #if defined(_MSC_VER) && _MSC_VER < 1800

 // round is not defined in MSVC before VS2013.

-static INLINE int round(double x) {

+static INLINE double round(double x) {

   if (x < 0)

-    return (int)ceil(x - 0.5);

+    return ceil(x - 0.5);

   else

-    return (int)floor(x + 0.5);

+    return floor(x + 0.5);

 }

 #endif