lib: save a bit of space with some structure packing

- Reorder some internal struct members so that less padding is used.

This is an attempt at saving a bit of space by packing some structs
(using pahole to find the holes) where it might make sense to do
so without losing readability.

I.e., I tried to avoid separating fields that seem grouped
together (like the cwd... fields in struct ftp_conn for instance).
Also abstained from touching fields behind conditional macros as
that quickly can get complicated.

Closes https://github.com/curl/curl/pull/6483

lib/cookie.h

@@ -34,12 +34,12 @@ struct Cookie {
   char *domain;      /* domain = <this> */
   curl_off_t expires;  /* expires = <this> */
   char *expirestr;   /* the plain text version */
-  bool tailmatch;    /* whether we do tail-matching of the domain name */
 
   /* RFC 2109 keywords. Version=1 means 2109-compliant cookie sending */
   char *version;     /* Version = <value> */
   char *maxage;      /* Max-Age = <value> */
 
+  bool tailmatch;    /* whether we do tail-matching of the domain name */
   bool secure;       /* whether the 'secure' keyword was used */
   bool livecookie;   /* updated from a server, not a stored file */
   bool httponly;     /* true if the httponly directive is present */
@@ -61,8 +61,8 @@ struct CookieInfo {
   struct Cookie *cookies[COOKIE_HASH_SIZE];
 
   char *filename;  /* file we read from/write to */
-  bool running;    /* state info, for cookie adding information */
   long numcookies; /* number of cookies in the "jar" */
+  bool running;    /* state info, for cookie adding information */
   bool newsession; /* new session, discard session cookies on load */
   int lastct;      /* last creation-time used in the jar */
 };