[devhelp] build: use install_man()

[Sébastien Wilmet <swilmet src gnome org>]

commit 473b1f85ddc4ad81d1131629a1876cdfaa63f894
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Dec 9 15:26:56 2019 +0100

    build: use install_man()

 data/meson.build | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/data/meson.build b/data/meson.build
index ad2bb5bb..691fc869 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -52,7 +52,4 @@ install_data(
   install_dir : join_paths(get_option('prefix'), get_option('datadir'), 'devhelp/assistant')
 )
 
-install_data(
-  'devhelp.1',
-  install_dir : join_paths(get_option('prefix'), get_option('mandir'), 'man1')
-)
+install_man('devhelp.1')