[pkg-s48-maint] Packages-arch-specific: Add scheme48

[Jorgen Schaefer]

Hello!
I've been told to contact you so that we don't get one FTBFS
report per week telling us that scheme48 doesn't compile on
architectures not specified in the Architecture: line.

Please add

%scheme48: hurd-i386 i386 m68k sparc powerpc arm mips mipsel hppa s390 sh netbsd-i386 freebsd-i386

to the file.

Thank you.

Please also consider auto-updating that file from time to time.

Regards,
        -- Jorgen

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