Fix build with Visual Studio 2015.

REVIEW: 128805

autotests/mainshelltest.cpp

@@ -24,7 +24,11 @@
 #include "../settings.h"
 
 #include <sys/types.h>
+#ifndef Q_OS_WIN
 #include <unistd.h>
+#else
+#include <process.h>
+#endif
 
 namespace Okular {
 class PartTest

ui/presentationwidget.cpp

@@ -2147,8 +2147,13 @@ void PresentationWidget::initTransition( const Okular::PageTransition *transitio
             // randomize the grid
             for ( int i = 0; i < steps; i++ )
             {
+#ifndef Q_OS_WIN
                 int n1 = (int)(steps * drand48());
                 int n2 = (int)(steps * drand48());
+#else
+                int n1 = (int)(steps * (std::rand() / RAND_MAX));
+                int n2 = (int)(steps * (std::rand() / RAND_MAX));
+#endif
                 // swap items if index differs
                 if ( n1 != n2 )
                 {
@@ -2238,8 +2243,13 @@ void PresentationWidget::initTransition( const Okular::PageTransition *transitio
             int randomSteps = steps / 20;
             for ( int i = 0; i < randomSteps; i++ )
             {
+#ifndef Q_OS_WIN
                 int n1 = (int)(steps * drand48());
                 int n2 = (int)(steps * drand48());
+#else
+                int n1 = (int)(steps * (std::rand() / RAND_MAX));
+                int n2 = (int)(steps * (std::rand() / RAND_MAX));
+#endif
                 // swap items if index differs
                 if ( n1 != n2 )
                 {