Fix some clang warnings

Clang was complaining about some unused functions. Moving the stack
declaration to the header seems to sort it. Also the certstatus variable
in dtlstest needed to be declared static.

Reviewed-by: Richard Levitte <levitte@openssl.org>

test/dtlstest.c

diff --git a/test/dtlstest.c b/test/dtlstest.c
index 06db5d2..4d497af 100644
--- a/test/dtlstest.c
+++ b/test/dtlstest.c
@@ -23,7 +23,7 @@
 
 #define DUMMY_CERT_STATUS_LEN  12
 
-unsigned char certstatus[] = {
+static unsigned char certstatus[] = {
     SSL3_RT_HANDSHAKE, /* Content type */
     0xfe, 0xfd, /* Record version */
     0, 1, /* Epoch */

test/ssltestlib.c

diff --git a/test/ssltestlib.c b/test/ssltestlib.c
index a6ca5ff..ff5cbed 100644
--- a/test/ssltestlib.c
+++ b/test/ssltestlib.c
@@ -238,8 +238,6 @@
     unsigned int type;
 } MEMPACKET;
 
-DEFINE_STACK_OF(MEMPACKET)
-
 static void mempacket_free(MEMPACKET *pkt)
 {
     if (pkt->data != NULL)

test/ssltestlib.h

diff --git a/test/ssltestlib.h b/test/ssltestlib.h
index 27f7547..bd9272f 100644
--- a/test/ssltestlib.h
+++ b/test/ssltestlib.h
@@ -33,4 +33,8 @@
 int mempacket_test_inject(BIO *bio, const char *in, int inl, int pktnum,
                           int type);
 
+typedef struct mempacket_st MEMPACKET;
+
+DEFINE_STACK_OF(MEMPACKET)
+
 #endif /* HEADER_SSLTESTLIB_H */