[goffice] dtoa: fix win32 build.

[Morten Welinder <mortenw src gnome org>]

commit f520c922c48683079051bd22cab62c570495d27d
Author: Morten Welinder <terra gnome org>
Date:   Thu Apr 10 18:27:23 2014 -0400

    dtoa: fix win32 build.

 ChangeLog              |    4 ++++
 goffice/math/go-dtoa.c |    5 +++++
 2 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index df8d443..45d9b29 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2014-04-10  Morten Welinder  <terra gnome org>
 
+       * goffice/math/go-dtoa.c: When building with
+       !GOFFICE_WITH_LONG_DOUBLE, don't use go_finitel.  Just assume we
+       have isfinite.
+
        * goffice/canvas/goc-item.c (cb_hierarchy_changed): Renamed from
        cb_parent_changed.
        (goc_item_get_style_context): Also watch ::canvas.
diff --git a/goffice/math/go-dtoa.c b/goffice/math/go-dtoa.c
index 96c352e..e44af34 100644
--- a/goffice/math/go-dtoa.c
+++ b/goffice/math/go-dtoa.c
@@ -39,6 +39,11 @@
 
 typedef GString FAKE_FILE;
 
+#ifndef GOFFICE_WITH_LONG_DOUBLE
+#define go_finitel isfinite
+#endif
+
+
 /* musl code starts here */
 
 /* Some useful macros */