8+3 file-name clashes

[Eli Zaretskii]

Some of the files installed lately clash in the 8+3 file-name space.
The relevant parts of `doschk' output are shown below.  Can we solve
this by renaming the offending files?

    The following resolve to the same DOS file names:
    ...
    DOCBOOK-.RNC   : ./etc/schema/docbook-dyntbl.rnc
                     ./etc/schema/docbook-soextbl.rnc
    ...
    MACEMACS.PNG   : ./etc/images/icons/macemacs_16.png
                     ./etc/images/icons/macemacs_24.png
                     ./etc/images/icons/macemacs_256.png
                     ./etc/images/icons/macemacs_32.png
                     ./etc/images/icons/macemacs_48.png
                     ./etc/images/icons/macemacs_512.png
    ...
    XHTML-BA.RNC   : ./etc/schema/xhtml-base.rnc
                     ./etc/schema/xhtml-basic-form.rnc
                     ./etc/schema/xhtml-basic-table.rnc
    XHTML-LI.RNC   : ./etc/schema/xhtml-link.rnc
                     ./etc/schema/xhtml-list.rnc
    XHTML-ST.RNC   : ./etc/schema/xhtml-struct.rnc
                     ./etc/schema/xhtml-style.rnc
    XHTML-TA.RNC   : ./etc/schema/xhtml-table.rnc
                     ./etc/schema/xhtml-target.rnc