[gnome-chess] Fix check for prctl

[Michael Catanzaro <mcatanzaro src gnome org>]

commit f6bf52b767a40e3def644c55d52dbe59cdfb704e
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Jul 27 20:37:24 2018 -0500

    Fix check for prctl
    
    The define got borked during the meson port

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e3bb14e..bcc14a3 100644
--- a/meson.build
+++ b/meson.build
@@ -39,7 +39,7 @@ has_prctl = meson.get_compiler('c').has_header('sys/prctl.h')
 
 # Configuration
 conf = configuration_data()
-conf.set10('HAVE_PRCTL', has_prctl)
+conf.set10('HAVE_LINUX_PRCTL_H', has_prctl)
 conf.set_quoted('GETTEXT_PACKAGE', meson.project_name())
 conf.set_quoted('LOCALEDIR', localedir)
 conf.set_quoted('PACKAGE_NAME', meson.project_name())