[libc,cmds] Fix isprint and kilo for CP 437 display #1752
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Fixes display problems in
kiloidentified by @Vutshi in #1748 (comment). This turned out to be a problem inisprintas well as sign extension on the character CP 437 character 0xff (non-blank space).The C library
isprintfunction is updated to designate the upper half of CP 437 as printable.