Fix declaration of qt_gettime for Q_DECL_NOTHROW

Since the #include wasn't present in the qelapsedtimer_{mac,unix}.cpp
files, we did not notice that the declaration missed the macro.

Change-Id: I3e4f23b28e127d41b12690cf306f47986be53d89
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

src/corelib/kernel/qcore_unix_p.h

@@ -310,7 +310,8 @@ static inline pid_t qt_safe_waitpid(pid_t pid, int *status, int options)
 #  define _POSIX_MONOTONIC_CLOCK -1
 #endif
 
-timeval qt_gettime(); // in qelapsedtimer_mac.cpp or qtimestamp_unix.cpp
+// in qelapsedtimer_mac.cpp or qtimestamp_unix.cpp
+timeval qt_gettime() Q_DECL_NOTHROW;
 
 Q_CORE_EXPORT int qt_safe_select(int nfds, fd_set *fdread, fd_set *fdwrite, fd_set *fdexcept,
                                  const struct timeval *tv);

src/corelib/tools/qelapsedtimer_mac.cpp

@@ -44,6 +44,7 @@
 #include <unistd.h>
 
 #include <mach/mach_time.h>
+#include <private/qcore_unix_p.h>
 
 QT_BEGIN_NAMESPACE
 

src/corelib/tools/qelapsedtimer_unix.cpp

@@ -47,6 +47,8 @@
 #include <time.h>
 #include <unistd.h>
 
+#include "private/qcore_unix_p.h"
+
 #if defined(QT_NO_CLOCK_MONOTONIC) || defined(QT_BOOTSTRAPPED)
 // turn off the monotonic clock
 # ifdef _POSIX_MONOTONIC_CLOCK