Use __builtin_unwind_init in the MSDOS build.

 msdos/sed2v2.inp (HAVE___BUILTIN_UNWIND_INIT): Define.

diff --cc msdos/ChangeLog
index 10cb8c7daed54d564b5f596b39bed7422297c375,10cb8c7daed54d564b5f596b39bed7422297c375..c649e736219c9a29399763f650393badf2aca8a1
--- 1/msdos/ChangeLog
--- 2/msdos/ChangeLog
+++ b/msdos/ChangeLog
@@@ -1,3 -1,3 +1,7 @@@
++2011-01-07  Eli Zaretskii  <eliz@gnu.org>
++
++      * sed2v2.inp (HAVE___BUILTIN_UNWIND_INIT): Define.
++
  2010-12-04  Andreas Schwab  <schwab@linux-m68k.org>
  
        * sed1v2.inp (M_FILE, S_FILE): Add $(srcdir)/ prefix.

diff --cc msdos/sed2v2.inp
index 3e77fe4f0234e19bf1d7d1cc553378581f080e30,3e77fe4f0234e19bf1d7d1cc553378581f080e30..556764423b99b599ca1577ce01afd3ba4dfce5fc
--- 1/msdos/sed2v2.inp
--- 2/msdos/sed2v2.inp
+++ b/msdos/sed2v2.inp
@@@ -50,6 -50,6 +50,7 @@@
  /^#undef HAVE_MKSTEMP *$/s/^.*$/#define HAVE_MKSTEMP 1/
  /^#undef HAVE_STRUCT_TM_TM_ZONE *$/s/^.*$/#define HAVE_STRUCT_TM_TM_ZONE 1/
  /^#undef HAVE_SYNC *$/s/^.*$/#define HAVE_SYNC 1/
++/^#undef HAVE___BUILTIN_UNWIND_INIT *$/s/^.*$/#define HAVE___BUILTIN_UNWIND_INIT 1/
  /^#undef ORDINARY_LINK/s/^.*$/#define ORDINARY_LINK 1/
  /^#undef PACKAGE_BUGREPORT/s/^.*$/#define PACKAGE_BUGREPORT ""/
  /^#undef PACKAGE_NAME/s/^.*$/#define PACKAGE_NAME ""/