[libgweather] build: Fix install_header() directive

[Emmanuele Bassi <ebassi src gnome org>]

commit 1e4adb45d8b55ec2eedb3e407113ce6fa6fbc72c
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Nov 27 14:19:35 2017 +0000

    build: Fix install_header() directive
    
    The appropriate location is defined by `subdir`, which will take into
    account the includedir.

 libgweather/meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgweather/meson.build b/libgweather/meson.build
index f3d9fd2..d33ded4 100644
--- a/libgweather/meson.build
+++ b/libgweather/meson.build
@@ -36,7 +36,7 @@ gweather_enum_types = gnome.mkenums('gweather-enum-types',
   install_header: true,
   install_dir: join_paths(includedir, header_subdir))
 install_headers(gweather_new_headers,
-  install_dir: header_subdir)
+  subdir: header_subdir)
 
 gweather_c_sources = [
   gweather_enum_types,