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tr: interpolate the request ending a macro

For example, in:

  .de XX YY
  .YY

In addition to marking the end of the macro XX, the macro YY
should also be interpolated.

--- a/tr.c

+++ b/tr.c

@@ -144,7 +144,9 @@

 			read_regname(buf);

 			if ((n_cp && end[0] == buf[0] && end[1] == buf[1]) ||

 						!strcmp(end, buf)) {

-				jmp_eol();

+				for (i = strlen(buf) - 1; i >= 0; i--)

+					cp_back((unsigned char) buf[i]);

+				cp_back('.');

 				break;

 			}

 			if (sbuf) {