strerror module fix

[Eric Blake]

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In trying out m4 on a Solaris 7 box, I noticed a failure in test-strerror,
due to broken ordering in configure for the REPLACE_STRERROR shell
variable.  Fixed as follows:

2007-12-03  Eric Blake  <address@hidden>

        * m4/strerror.m4 (gl_FUNC_STRERROR_SEPARATE): Ensure
        REPLACE_STRERROR is initialized before this macro.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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diff --git a/ChangeLog b/ChangeLog
index 06e0ee8..43d31a6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2007-12-03  Eric Blake  <address@hidden>
+
+       * m4/strerror.m4 (gl_FUNC_STRERROR_SEPARATE): Ensure
+       REPLACE_STRERROR is initialized before this macro.
+
 2007-12-03  Paul Eggert  <address@hidden>
 
        Add support for Solaris 10 ACLs.  Also, ACLs are Gnulib, not Autoconf.
diff --git a/m4/strerror.m4 b/m4/strerror.m4
index 9cb5769..78b8891 100644
--- a/m4/strerror.m4
+++ b/m4/strerror.m4
@@ -17,6 +17,7 @@ AC_DEFUN([gl_FUNC_STRERROR],
 # Like gl_FUNC_STRERROR, except prepare for separate compilation (no 
AC_LIBOBJ).
 AC_DEFUN([gl_FUNC_STRERROR_SEPARATE],
 [
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
   AC_CACHE_CHECK([for working strerror function],
    [gl_cv_func_working_strerror],
    [AC_RUN_IFELSE(