Fix compilation of qfilesystemengine on VxWorks

Change-Id: I533f262bf6624008d216d96aa29ae2dfc4ba9195
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

mkspecs/common/vxworks/qplatformdefs.h

@@ -34,6 +34,8 @@
 #define QT_SNPRINTF             ::snprintf
 #define QT_VSNPRINTF            ::vsnprintf
 
+#define S_ISVTX 01000
+
 /* vxworks exposes these definitions only when _POSIX_C_SOURCE >=200809L but we don't want to set this, as it hides other API */
 #ifndef UTIME_NOW
 #  define UTIME_NOW       ((1l << 30) - 1l)

src/corelib/io/qfilesystemengine_unix.cpp

@@ -12,6 +12,7 @@
 #include <QtCore/qoperatingsystemversion.h>
 #include <QtCore/private/qcore_unix_p.h>
 #include <QtCore/private/qfiledevice_p.h>
+#include <QtCore/private/qfunctions_p.h>
 #include <QtCore/qvarlengtharray.h>
 #ifndef QT_BOOTSTRAPPED
 # include <QtCore/qstandardpaths.h>