Problem:    MSVC can't have field name "small".
Solution:   Rename small to smallfont.

Problem:    MS-Windows: mouse scrolling not supported in the console.
Solution:   Add event handling for mouse scroll events. (Christopher
            Plewright, closes #11374)

Problem:    The libvterm code is outdated.
Solution:   Include libvterm changes from revision 802 to 817.  Revert some
            changes made for C89.

Problem:    Huge build on macos uses dynamic Perl.
Solution:   Use built-in Perl, uninstall the brew one. (closes #11382)

Problem:    The libvterm code is outdated.
Solution:   Include libvterm changes from revision 790 to 801.

Problem:    Cannot always tell the difference beween tex and rexx files.
Solution:   Recognize tex by a leading backslash. (Martin Tournoij,
            closes #11380)

Problem:    Quickfix commands may keep memory allocated.
Solution:   Free memory when it's a bit much. (Yegappan Lakshmanan,
            closes #11379)

Problem:    Too many delete() calls in tests.
Solution:   Use deferred delete where possible.

Problem:    Too many delete() calls in tests.
Solution:   Use deferred delete where possible.