KEYS: Remove unnecessary header #inclusions from extract-cert.c

Remove headers #included unnecessarily from extract-cert.c lest they cause
compilation of the tool to fail against an older OpenSSL library.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>

scripts/extract-cert.c

@@ -17,13 +17,9 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <string.h>
-#include <getopt.h>
 #include <err.h>
-#include <arpa/inet.h>
 #include <openssl/bio.h>
-#include <openssl/evp.h>
 #include <openssl/pem.h>
-#include <openssl/pkcs7.h>
 #include <openssl/err.h>
 #include <openssl/engine.h>