Merged r6430 from trunk.
PDF: remove unused vera*.rb.
PDF: remove unused sjis.rb (#8892).
PDF: remove unused zapfdingbats.rb (#8892).
PDF: remove unused symbol.rb (#8892).
PDF: remove unused courier.rb (#8892).
PDF: remove unused times*.rb (#8892).
PDF: remove unused vera*.rb (#8892).
Merged r6427 from trunk.
PDF: remove unused vera fonts.
Merged r6426 from trunk.
PDF: remove unused FreeMono fonts.
PDF: remove unused vera fonts (#8892).