build: Delete unused files (#1195)

Delete files that have no impact on the three IWADs built by searching
for references to them. Deleting these files has no impact on the
three IWADs built so long as "VERSION" in "Makefile" is changed to a
static string.

patches/agm_logo/new agm logo roundedv4e.svg

@@ -1,84 +0,0 @@
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