tool: include base.h before testing OPENSSL_WINDOWS.

Even though windows.h etc are system headers, conditional includes have
to come after the others.

Change-Id: I839b3b6c32a76c806698e2cdc71e50433fa900b2
diff --git a/tool/speed.cc b/tool/speed.cc
index 6b635b0..ab17c2f 100644
--- a/tool/speed.cc
+++ b/tool/speed.cc
@@ -20,6 +20,13 @@
 #include <stdint.h>
 #include <string.h>
 
+#include <openssl/aead.h>
+#include <openssl/digest.h>
+#include <openssl/err.h>
+#include <openssl/obj.h>
+#include <openssl/rand.h>
+#include <openssl/rsa.h>
+
 #if defined(OPENSSL_WINDOWS)
 #pragma warning(push, 3)
 #include <windows.h>
@@ -28,13 +35,6 @@
 #include <sys/time.h>
 #endif
 
-#include <openssl/aead.h>
-#include <openssl/digest.h>
-#include <openssl/err.h>
-#include <openssl/obj.h>
-#include <openssl/rand.h>
-#include <openssl/rsa.h>
-
 #include "../crypto/test/scoped_types.h"