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7c: do NOT allocate link register for general use

--- a/sys/src/cmd/7c/txt.c

+++ b/sys/src/cmd/7c/txt.c

@@ -101,6 +101,7 @@

 	/* don't allocate */

 	reg[REGTMP] = 1;

 	reg[REGSB] = 1;

+	reg[REGLINK] = 1;

 	reg[REGSP] = 1;

 	reg[REGZERO] = 1;

 	/* keep two external registers */