[rrdtool-maint] Please give back rrdtool on sh4

[Jean-Michel Vourgère]

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Dear wanna-build team,

please try rrdtool again:

gb rrdtool_1.5.6-1 . sh4


Previous version 1.5.5-4 was building ok and changes are unrelated.

The message "failed to import Cython" is weird since that dependency
issue doesn't occur in any other arch...

Thanks!
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