[Bug 281496] devel/olm: fix build with clang 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281496

            Bug ID: 281496
           Summary: devel/olm: fix build with clang 19
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: dim@FreeBSD.org

Clang 19 has become more strict about assigning to const variables,
resulting in an error similar to:

 
/wrkdirs/usr/ports/security/olm/work/olm-6d767aaf29bdf15571c2ef4d3f8f9e953de03733/include/olm/list.hh:106:13:
error: cannot assign to variable 'other_pos' with const-qualified type 'T
*const'
    106 |             ++other_pos;
        |             ^ ~~~~~~~~~
 
/wrkdirs/usr/ports/security/olm/work/olm-6d767aaf29bdf15571c2ef4d3f8f9e953de03733/include/olm/list.hh:102:19:
note: variable 'other_pos' declared const here
    102 |         T * const other_pos = other._data;
        |         ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

In this case, it looks like a typo: "T * const" means that the pointer
itself is const, thus it cannot be incremented. Instead, this should be
"T const *" (spelled alternatively as "const T *"), which means that the
object pointed to is const, not the pointer itself.

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