[retro-gtk] meson: Unify dir definitions

[Alexander Mikhaylenko <alexm src gnome org>]

commit d5f4d75850a66f908dc40caeb537acbf73be82aa
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Oct 16 08:36:08 2020 +0200

    meson: Unify dir definitions
    
    This unifies and simplifies the code a bit more.

 meson.build       | 8 +++-----
 tests/meson.build | 5 ++---
 2 files changed, 5 insertions(+), 8 deletions(-)
---
diff --git a/meson.build b/meson.build
index 6605dc70..366872df 100644
--- a/meson.build
+++ b/meson.build
@@ -3,9 +3,6 @@ project('retro-gtk','c',
   meson_version: '>= 0.50.0',
 )
 
-retro_gtk_prefix = get_option('prefix')
-retro_gtk_datadir = retro_gtk_prefix / get_option('datadir')
-
 cc = meson.get_compiler('c')
 gnome = import('gnome')
 
@@ -13,6 +10,7 @@ prefix = get_option('prefix')
 libdir = prefix / get_option('libdir')
 libexecdir = prefix / get_option('libexecdir')
 libretrodir = libdir / 'libretro'
+datadir = prefix / get_option('datadir')
 
 confinc = include_directories('.')
 shared_inc = include_directories('shared')
@@ -69,8 +67,8 @@ summary = [
   '   Install documentation: @0@'.format(get_option('install-doc')),
   '                   Demos: @0@'.format(get_option('demos')),
   'Directories:',
-  '                  prefix: @0@'.format(retro_gtk_prefix),
-  '                 datadir: @0@'.format(retro_gtk_datadir),
+  '                  prefix: @0@'.format(prefix),
+  '                 datadir: @0@'.format(datadir),
   '------',
   ''
 ]
diff --git a/tests/meson.build b/tests/meson.build
index 3c950101..d8973d3f 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -1,6 +1,5 @@
-retro_gtk_libexecdir = retro_gtk_prefix / get_option('libexecdir')
-installed_test_bindir = retro_gtk_libexecdir / 'installed-tests' / retro_gtk_module
-installed_test_datadir = retro_gtk_datadir / 'installed-tests' / retro_gtk_module
+installed_test_bindir = libexecdir / 'installed-tests' / retro_gtk_module
+installed_test_datadir = datadir / 'installed-tests' / retro_gtk_module
 
 testlibretrodir = installed_test_datadir / 'libretro'
 testexecdir = installed_test_bindir