[ghex] build: Install appstream metadata to non-deprecated location

[Kalev Lember <klember src gnome org>]

commit 63c7a1fd235ad93301a6c74db3f8faa988d43118
Author: Kalev Lember <klember redhat com>
Date:   Mon Mar 12 12:23:12 2018 +0100

    build: Install appstream metadata to non-deprecated location
    
    Same fix as commit e39d13e7f33836aa9f0b27c117bcf2224bcc0530, this time
    for the new meson build system.

 meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meson.build b/meson.build
index f7379da..d2341c9 100644
--- a/meson.build
+++ b/meson.build
@@ -20,7 +20,7 @@ ghex_localedir = join_paths(ghex_prefix, get_option('localedir'))
 ghex_pkgconfigdir = join_paths(ghex_libdir, 'pkgconfig')
 ghex_applicationsdir = join_paths(ghex_datadir, 'applications')
 ghex_schemasdir = join_paths(ghex_datadir, 'glib-2.0/schemas')
-ghex_appdatadir = join_paths(ghex_datadir, 'appdata')
+ghex_appdatadir = join_paths(ghex_datadir, 'metainfo')
 ghex_iconsdir = join_paths(ghex_datadir, 'icons')
 
 ghex_root_dir = include_directories('.')