app-cdr/cdrtools: keyword for -riscv

Uses a byzantine "build system" (i.e. a massive pile of makefiles) which
we already have to patch extensively to play nicely with Gentoo
conventions, and which has made it a major pain in the neck for me when
I tried to figure out why it takes a different path on rv64 than on
amd64 (and presumably other already-supported arches). Anyway, what
happens here is:
 - while trying to compile align_test, make calls 'makedepend' rather
   than 'gcc -M' to generate dependencies. This doesn't work correctly
   in our case for clean installs (makedepend cannot find
   include/schily), resulting in a .d file containing nothing but a 'do
   not delete' comment
 - the scripts attempt extract of the name of the compiler which is to
   be used to build align_test from the .d file, and with the file being
   empty end up using an empty string instead;
 - align_test is not compiled -> align.h is not generated -> everything
   falls over.

Nb. this is unlikely to be fixed upstream because standalone cdrtools
have been deprecated in favour of schily-tools since at least 2018 - see
Bug #672060.

Signed-off-by: Marek Szuba <marecki@gentoo.org>

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