Build with MSVC2005 fixed

To use __rdtsc() function MSVC2005 requires including intrin.h
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

AUTHORS

@@ -67,6 +67,7 @@ John Apps <john.apps@hp.com>
 Markus Fischer <markus.fischer@hpc-solutions.com>
 Matt Muggeridge <Matt.Muggeridge@hp.com>
 Michael Santy <Michael.Santy@dynetics.com>
+Oleg Sevostyanov <oleg.sev@gmail.com>
 Paulo Henrique Silva <ph.silva@gmail.com>
 Peter Busser <busserpeter@gmail.com>
 Peter Lemenkov <lemenkov@gmail.com>

src/clock.cpp

@@ -25,6 +25,10 @@
 
 #include <stddef.h>
 
+#if defined _MSC_VER
+#include <intrin.h>
+#endif
+
 #if !defined ZMQ_HAVE_WINDOWS
 #include <sys/time.h>
 #endif