[glib/wip/tingping/rtld-check-fix] build: Fix check for RTLD_NEXT

[Patrick Griffis <pgriffis src gnome org>]

commit 641966c1bbc3b37d546824b1b146bce2045fdf5a
Author: Patrick Griffis <pgriffis igalia com>
Date:   Tue Apr 16 09:22:11 2019 -0700

    build: Fix check for RTLD_NEXT

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 85433fb3b..338e49ed4 100644
--- a/meson.build
+++ b/meson.build
@@ -593,7 +593,7 @@ if cc.has_header_symbol('dlfcn.h', 'RTLD_GLOBAL')
 endif
 
 have_rtld_next = false
-if cc.has_header_symbol('dlfcn.h', 'RTLD_NEXT')
+if cc.has_header_symbol('dlfcn.h', 'RTLD_NEXT', args: '-D_GNU_SOURCE')
   have_rtld_next = true
   glib_conf.set('HAVE_RTLD_NEXT', 1)
 endif