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shift-jis: add support for half-width kana

--- a/sys/src/cmd/tcs/conv_jis.c

+++ b/sys/src/cmd/tcs/conv_jis.c

@@ -133,6 +133,10 @@

 				return;

 			}

 		}

+		if(!set8 && c >= 161 && c <= 223){

+			emit(0xFEC0 + c);

+			return;

+		}

 		lastc = c; state = state4; return;

 	case state1:	/* seen an escape */