fix incorrect option names

data/meson.build

@@ -0,0 +1,3 @@
+install_data('lightdm-webkit2-greeter.desktop', install_dir: get_option('with-desktop-dir'))
+
+install_data('lightdm-webkit2-greeter.conf', install_dir: '/etc/lightdm')

man/meson.build

@@ -0,0 +1 @@
+install_man('lightdm-webkit2-greeter.1')

meson.build

@@ -60,7 +60,7 @@ conf.set('DESKTOP_DIR', '"@0@"'.format(get_option('with-desktop-dir')))
 # ------->>> Sub Directories <<<------- #
 # ===================================== #
 
-subdirs = ['src']
+subdirs = ['src', 'man', 'themes', 'data']
 
 foreach s : subdirs
   subdir(s)

themes/meson.build

@@ -0,0 +1,5 @@
+install_subdir('_vendor', install_dir : get_option('with-theme-dir'))
+
+install_subdir('antergos', install_dir : get_option('with-theme-dir'))
+
+install_subdir('simple', install_dir : get_option('with-theme-dir'))