archivers/zpaq: fix build on armv6/armv7
The ARM EABI has an unsigned char type. Fix the build
by using explicitly signed chars in the relevant place.
PR: 263389
(cherry picked from commit 6a9ffb1def637dff98c61432f10b610c7aecfedb)
archivers/zpaq: fix build on armv6/armv7 Tags None Referenced Files None Subscribers None
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