frexpl and mingw

[Eric Blake]

Natively, frexpl.m4 detects that mingw's frexpl chokes on NaN.  But cross-
compiling, we goof:

checking whether frexpl works... guessing yes

Checking this in...

2007-05-31  Eric Blake  <address@hidden>

        * m4/frexpl.m4 (gl_FUNC_FREXPL_WORKS): Guess no on mingw when
        cross compiling.

Index: m4/frexpl.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/frexpl.m4,v
retrieving revision 1.10
diff -u -p -r1.10 frexpl.m4
--- m4/frexpl.m4        20 May 2007 10:26:35 -0000      1.10
+++ m4/frexpl.m4        31 May 2007 15:58:23 -0000
@@ -142,7 +142,7 @@ int main()
   return 0;
 }], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no],
       [case "$host_os" in
-         aix* | beos* | irix*) gl_cv_func_frexpl_works="guessing no";;
+         aix* | beos* | irix* | mingw*) gl_cv_func_frexpl_works="guessing no";;
          *)                    gl_cv_func_frexpl_works="guessing yes";;
        esac
       ])