[dia] win32: fix broken build

[Zander <zbrown src gnome org>]

commit b7086a9e8e9cac9a4d96adf28f25686f7e8ab761
Author: Zander Brown <zbrown gnome org>
Date:   Wed Apr 22 10:54:57 2020 +0100

    win32: fix broken build
    
    Fix https://gitlab.gnome.org/GNOME/dia/-/issues/453

 meson.build | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/meson.build b/meson.build
index a2019f30..ea54a764 100644
--- a/meson.build
+++ b/meson.build
@@ -31,6 +31,8 @@ libogdf_dep = cc.find_library('ogdf', required: false)
 conf.set('HAVE_OGDF', libogdf_dep.found())
 libxslt_dep = dependency('libxslt', required: false)
 conf.set('HAVE_XSLT', libxslt_dep.found())
+# TODO: Why does Win32 break without this
+conf.set('ENABLE_NLS', true)
 
 libgdk_dep  = dependency('gdk-2.0')
 gdk_target = libgdk_dep.get_pkgconfig_variable('target')