AC_CHECK_HEADERS from git doesn't add newlines

[Ozkan Sezer]

AC_CHECK_HEADERS is missing newlines in autoconf-git current. This is
starting with:

commit 0e2eecedb12dd472c9a008748be6edd6ea68fa0e
Author: Paolo Bonzini <address@hidden>
Date:   Mon Oct 31 18:08:07 2016 +0100

    autoconf: prefer an unrolled loop for trivial AC_CHECK_HEADERS


Here is the issue: (The PA_ADD_HEADERS stuff is from nasm configury)

$ cat aclocal.m4
dnl --------------------------------------------------------------------------
dnl PA_ADD_HEADERS(headers...)
dnl
dnl Call AC_CHECK_HEADERS(), and add to ac_includes_default if found
dnl --------------------------------------------------------------------------
AC_DEFUN(_PA_ADD_HEADER,
[AC_CHECK_HEADERS([$1],[ac_includes_default="$ac_includes_default
#include <$1>"
])])

AC_DEFUN(PA_ADD_HEADERS,
[m4_map_args_w([$1],[_PA_ADD_HEADER(],[)])])

$ cat configure.ac
AC_INIT
PA_ADD_HEADERS(endian.h sys/endian.h machine/endian.h)


The relevart parts of the diff between the good and the bad configure
generated is the following:

-done
-for ac_header in sys/endian.h
+donefor ac_header in sys/endian.h

[...]

-done
-for ac_header in machine/endian.h
+donefor ac_header in machine/endian.h


As a result the generated configure fails to run, of course.

--
O.S.