make configure work with symlinked lib/getloadavg.c again

[Jim Meyering]

coreutils' configure-time test for existence of lib/getloadavg.c
was failing because that file is now typically a symlink.

Here's how I've fixed it:

2006-10-12  Jim Meyering  <address@hidden>

        * m4/getloadavg.m4 (gl_GETLOADAVG): Test for the existence of
        lib/getloadavg.c using "ls -L", not "test -f".  The latter would
        fail with a symlink, which is what coreutils' ./bootstrap now
        creates by default.

Index: m4/getloadavg.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/getloadavg.m4,v
retrieving revision 1.19
diff -u -r1.19 getloadavg.m4
--- m4/getloadavg.m4    25 Sep 2006 11:58:08 -0000      1.19
+++ m4/getloadavg.m4    12 Oct 2006 13:19:39 -0000
@@ -16,7 +16,7 @@
 [gl_have_func=no # yes means we've found a way to get the load average.

 # Make sure getloadavg.c is where it belongs, at configure-time.
-test -f "$srcdir/$1/getloadavg.c" ||
+ls -L "$srcdir/$1/getloadavg.c" >/dev/null ||
   AC_MSG_ERROR([$srcdir/$1/getloadavg.c is missing])

 gl_save_LIBS=$LIBS