Mark test as expected failure since neither cpp nor cpplib get it right,

and it is not going to be fixed any time soon...

From-SVN: r28668

gcc/testsuite/gcc.dg/990119-1.c

@@ -1,7 +1,7 @@
 /* This checks for two things:
    - an obscure corner case in the standard rules for __LINE__
    - regression of an associated bug in cpplib where the semicolon got lost */
-/* { dg-do run } */
+/* { dg-do run {xfail *-*-*} } *//* Currently this corner case is not handled correctly.  */
 
 int i = __LINE__\
 ;