Avoid silly compiler warnings about functions not being declared and an int missing.

crypto/pkcs7/dec.c

@@ -57,6 +57,7 @@
  */
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <openssl/bio.h>
 #include <openssl/x509.h>
 #include <openssl/pem.h>

crypto/pkcs7/enc.c

@@ -56,6 +56,7 @@
  * [including the GNU Public Licence.]
  */
 #include <stdio.h>
+#include <string.h>
 #include <openssl/bio.h>
 #include <openssl/x509.h>
 #include <openssl/pem.h>

crypto/pkcs7/example.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <openssl/pkcs7.h>
 #include <openssl/asn1_mac.h>
 
@@ -68,7 +69,7 @@ int get_signed_string(PKCS7_SIGNER_INFO *si, char *buf, int len)
 	return(0);
 	}
 
-static signed_seq2string_nid= -1;
+static int signed_seq2string_nid= -1;
 /* ########################################### */
 int add_signed_seq2string(PKCS7_SIGNER_INFO *si, char *str1, char *str2)
 	{

crypto/pkcs7/sign.c

@@ -56,6 +56,7 @@
  * [including the GNU Public Licence.]
  */
 #include <stdio.h>
+#include <string.h>
 #include <openssl/bio.h>
 #include <openssl/x509.h>
 #include <openssl/pem.h>

crypto/pkcs7/verify.c

@@ -56,6 +56,7 @@
  * [including the GNU Public Licence.]
  */
 #include <stdio.h>
+#include <string.h>
 #include <openssl/bio.h>
 #include <openssl/asn1.h>
 #include <openssl/x509.h>