[gedit] build: avoid the use of dir variables

[Sébastien Wilmet <swilmet src gnome org>]

commit 4a05611eda0882de959619d3973f328fbcf0f9ec
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Dec 6 08:38:57 2019 +0100

    build: avoid the use of dir variables
    
    All those *dir variables make the code a bit less clear in my opinion.
    We need to look where the variable is assigned for the last time. All
    variables in meson are global, and they are not const, so another
    meson.build file can overwrite the value by accident.
    
    When reading "get_option('prefix')" etc, everybody who has learned meson
    is able to understand the code without looking elsewhere in the build
    system. And it's short enough.

 meson.build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 63e6134af..0040e5990 100644
--- a/meson.build
+++ b/meson.build
@@ -139,7 +139,8 @@ endif
 
 meson.add_install_script(
   'build-aux/meson/post_install.py',
-  libdir, datadir,
+  join_paths(get_option('prefix'), get_option('libdir')),
+  join_paths(get_option('prefix'), get_option('datadir'))
 )
 
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