Build fix for Mac OS

Change-Id: Iec4e4fdddf6b5eadbdcaae2500df841f0cf57dd4
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

src/libs/utils/savefile.cpp

@@ -89,6 +89,8 @@ bool SaveFile::commit()
     }
 #ifdef Q_OS_WIN
     FlushFileBuffers(reinterpret_cast<HANDLE>(handle()));
+#elif defined(Q_OS_MAC)
+    fsync(handle());
 #else
     fdatasync(handle());
 #endif