isnanl-nolibm failure

[Simon Josefsson]

Bruno, this command fails:

gnulib-tool --test --with-tests isnanl-nolibm

with an error:

../../gltests/test-isnanl.h:24:17: error: nan.h: No such file or directory

See:

http://autobuild.josefsson.org/gnulib/log-200903010845939381000.txt

How about this patch?  Inspired by the isnanl-tests module.

/Simon

diff --git a/modules/isnanl-nolibm-tests b/modules/isnanl-nolibm-tests
index a2e241c..f9414e3 100644
--- a/modules/isnanl-nolibm-tests
+++ b/modules/isnanl-nolibm-tests
@@ -1,6 +1,7 @@
 Files:
 tests/test-isnanl-nolibm.c
 tests/test-isnanl.h
+tests/nan.h
 
 Depends-on:
 float