[tracker] build: Make gsettings_schema_dir absolute

[Sam Thursfield <sthursfield src gnome org>]

commit a17cf081fc2aa2f2d8c03d29c2c093f4489ef8b1
Author: Sam Thursfield <sam afuera me uk>
Date:   Wed Jul 10 15:49:47 2019 +0100

    build: Make gsettings_schema_dir absolute
    
    This fixes `ninja install`, which was broken since
    aef285b4a801ba7e9d8c166.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 7bfa10ec2..82c75ae4e 100644
--- a/meson.build
+++ b/meson.build
@@ -319,7 +319,7 @@ source_root = meson.current_source_dir()
 build_root = meson.current_build_dir()
 po_subdir = join_paths(source_root, 'po')
 
-gsettings_schema_dir = join_paths(get_option('datadir'), 'glib-2.0', 'schemas')
+gsettings_schema_dir = join_paths(get_option('prefix'), get_option('datadir'), 'glib-2.0', 'schemas')
 
 tracker_internal_libs_dir = join_paths(get_option('prefix'), get_option('libdir'), 'tracker-' + 
tracker_api_version)
 tracker_install_rpath = ':'.join([tracker_internal_libs_dir, libdir])