testsuite/lib: Improve failure error message

Add the match string to the filure message to get better context into
what test pattern is not matching.  This helps a lot when tracking down
bugs.

Author: stffrdhrn

testsuite/lib/libsim.exp

@@ -113,7 +113,7 @@ proc run_libsim { testname match_list libprog config or1kprog args } {
 	    }
 
 	    eof {
-		fail "$testname: hit EOF seeking match line $match_line";
+		fail "$testname: hit EOF seeking match line $match_line: $matchstr";
 		return
 	    }
 

testsuite/lib/or1ksim.exp

@@ -136,7 +136,7 @@ proc run_or1ksim { testname match_list config_file progname } {
 	    }
 
 	    eof {
-		fail "$testname: hit EOF seeking match line $match_line";
+		fail "$testname: hit EOF seeking match line $match_line: $matchstr";
 		return
 	    }