[libsecret] meson: Point to the base directory of header files in pkgconfig

[Daiki Ueno <dueno src gnome org>]

commit 06d803c47859284fecb35051dc11da4e3236e6d1
Author: Daiki Ueno <dueno src gnome org>
Date:   Tue Oct 15 10:33:28 2019 +0200

    meson: Point to the base directory of header files in pkgconfig
    
    Fixes commit 22d11f8b22c095db096e24eabe45e7e0e02fe034

 libsecret/meson.build | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/libsecret/meson.build b/libsecret/meson.build
index ea13628..09041ce 100644
--- a/libsecret/meson.build
+++ b/libsecret/meson.build
@@ -1,4 +1,5 @@
-installed_headers_subdir = 'libsecret-@0@'.format(api_version_major) / 'libsecret'
+installed_headers_subdir_base = 'libsecret-@0@'.format(api_version_major)
+installed_headers_subdir = installed_headers_subdir_base / 'libsecret'
 
 libsecret_sources = [
   'secret-attributes.c',
@@ -166,7 +167,7 @@ libsecret_pc_variables = [
 pkg.generate(libsecret,
             description: 'GObject bindings for Secret Service API',
             name: 'libsecret-@0@'.format(api_version_major),
-            subdirs: installed_headers_subdir,
+            subdirs: installed_headers_subdir_base,
             variables: libsecret_pc_variables,
             requires: glib_deps)