security.h: rename to curl_sec.h to avoid name collision

I brought back security.h in commit bb55293313. As we actually
already found out back in 2005 in commit 62970da675, the file name
security.h causes problems so I renamed it curl_sec.h instead.

lib/Makefile.inc

@@ -31,7 +31,7 @@ CSOURCES = file.c timeval.c base64.c hostip.c progress.c formdata.c	\
 HHEADERS = arpa_telnet.h netrc.h file.h timeval.h qssl.h hostip.h	\
   progress.h formdata.h cookie.h http.h sendf.h ftp.h url.h dict.h	\
   if2ip.h speedcheck.h urldata.h curl_ldap.h ssluse.h escape.h telnet.h	\
-  getinfo.h strequal.h security.h memdebug.h http_chunks.h              \
+  getinfo.h strequal.h curl_sec.h memdebug.h http_chunks.h              \
   curl_fnmatch.h wildcard.h fileinfo.h ftplistparser.h strtok.h		\
   connect.h llist.h hash.h content_encoding.h share.h curl_md4.h	\
   curl_md5.h http_digest.h http_negotiate.h inet_pton.h amigaos.h	\

lib/ftp.c

@@ -59,7 +59,7 @@
 #include "ftp.h"
 #include "fileinfo.h"
 #include "ftplistparser.h"
-#include "security.h"
+#include "curl_sec.h"
 #include "strtoofft.h"
 #include "strequal.h"
 #include "sslgen.h"

lib/krb5.c

@@ -1,6 +1,6 @@
 /* GSSAPI/krb5 support for FTP - loosely based on old krb4.c
  *
- * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
+ * Copyright (c) 1995, 1996, 1997, 1998, 1999, 2013 Kungliga Tekniska Högskolan
  * (Royal Institute of Technology, Stockholm, Sweden).
  * Copyright (c) 2004 - 2012 Daniel Stenberg
  * All rights reserved.
@@ -51,7 +51,7 @@
 #include "ftp.h"
 #include "curl_gssapi.h"
 #include "sendf.h"
-#include "security.h"
+#include "curl_sec.h"
 #include "curl_memory.h"
 #include "warnless.h"
 

lib/security.c

@@ -57,7 +57,7 @@
 #include "urldata.h"
 #include "curl_base64.h"
 #include "curl_memory.h"
-#include "security.h"
+#include "curl_sec.h"
 #include "ftp.h"
 #include "sendf.h"
 #include "rawstr.h"