Display of some multi-line links is cut off in the middle

* Problem:
In lynx2.9.0dev.10, display of some multi-line links is cut off in the middle.
lynx2.9.0dev.9 does not have the problem.

* Actual Result:
lynx https://lists.nongnu.org/archive/html/lynx-dev/2021-10/threads.html

>     * [13][Lynx-dev] Build failures on hppa architectures after update
>       fr

* Expected Result:
>     * [13][Lynx-dev] Build failures on hppa architectures after update
>       from 2.9.0dev.9 to 2.9.0dev.10, Axel Beckert, 2021/10/30

* Fix:
Reverting following change solves the problem.
--- lynx2.9.0dev.9/src/GridText.c	2021-06-30 07:01:12.000000000 +0900
+++ lynx2.9.0dev.10/src/GridText.c	2021-10-25 01:13:59.000000000 +0900
@@ -3006,7 +3005,7 @@
 	    ctrl_chars_on_this_line += utfxtra_on_this_line;
 
 	    /* Add the data to the new line. -FM */
-	    strcat(linedata, p);
+	    for (i = 0; (linedata[i] = p[i]) != '\0'; ++i) ;
 	    line->size = (unsigned short) (line->size + plen);
 	}
     }