The output of mutt_local_tz() was being passed to abs(). Technically
the return type is time_t, but it represents a small value: the timezone
offset in seconds. Add a safe explicit cast to int.
Change the txt parameter of mutt_make_help() to type const char *.
Typically all calls run the txt parameter through _(), which
accepts const char * and returns a char *. However, if NLS is not
enabled, _() is a noop, simply returning the parameter itself. In
mutt_compile_help(), items[i].name is const char *, so it will generate
a warning when passed as the txt parameter of mutt_make_help().
On some systems, e.g. OS X, snprintf is defined as a macro. One call
in hcache.c was embedding directives inside the snprintf call. This is
apparently undefined behavior, so duplicate the call instead.