[devhelp] build: use add_project_arguments() instead of add_global_arguments()

[Sébastien Wilmet <swilmet src gnome org>]

commit 5c0911d04cf2e3256700c4f741058e91190a4e03
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Nov 11 10:21:24 2019 +0100

    build: use add_project_arguments() instead of add_global_arguments()
    
    See the documentation of those functions.

 meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 846241ff..77e57b04 100644
--- a/meson.build
+++ b/meson.build
@@ -94,7 +94,7 @@ CONFIG_H_INCLUDE_DIR = include_directories('.')
 # For #include <devhelp/something.h>
 ROOT_INCLUDE_DIR = include_directories('.')
 
-add_global_arguments(
+add_project_arguments(
   '-DG_LOG_DOMAIN="@0@"'.format(meson.project_name()),
   language : 'c'
 )
@@ -151,7 +151,7 @@ warning_cflags = [
 
 c_compiler = meson.get_compiler('c')
 supported_warning_cflags = c_compiler.get_supported_arguments(warning_cflags)
-add_global_arguments(supported_warning_cflags, language : 'c')
+add_project_arguments(supported_warning_cflags, language : 'c')
 ##### end CFLAGS
 
 subdir('data')