[Bug 209077] net/opal: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209077

--- Comment #3 from Dimitry Andric <dim at FreeBSD.org> ---
E.g. something like this:

--- plugins/video/common/mpi.cxx.orig   2013-02-20 02:18:05 UTC
+++ plugins/video/common/mpi.cxx
@@ -118,6 +118,11 @@ unsigned MPIList::getSupportedMPI( unsig
   return PLUGINCODEC_MPI_DISABLED;
 }

+static inline unsigned udiff(unsigned u, unsigned v)
+{
+  return u >= v ? u - v : v - u;
+}
+
 bool MPIList::getNegotiatedMPI( unsigned* width, unsigned* height, unsigned*
_frameTime)
 {
   unsigned i = 0;
@@ -132,8 +137,8 @@ bool MPIList::getNegotiatedMPI( unsigned
   // to the desired one or matches it
   for (i=0; i < MPIs.size(); i++) {
     // we square the value in order to get absolute distances
-    distance = ( abs(MPIs[i].width  - desiredWidth ) *
-                 abs(MPIs[i].height - desiredHeight) );
+    distance = ( udiff(MPIs[i].width,  desiredWidth ) *
+                 udiff(MPIs[i].height, desiredHeight) );

     if (distance < minDistance) {
       minDistance = distance;

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