Fixed a typo error (#929)

Hi

I have fixed a little typo error: a double semicolon at the end of one line

ciao
matteo

src/Crypto/jitterentropy-base-user.h

@@ -79,7 +79,7 @@ static VC_INLINE void jent_get_nstime(uint64 *out)
 #endif
 		* out = v.QuadPart;
 #else
-	*out = __rdtsc();;
+	*out = __rdtsc();
 #endif
 }