patch-meson.build

--- meson.build.orig	2024-08-06 19:05:00 UTC
+++ meson.build
@@ -97,7 +97,7 @@ install_datadir = get_option('datadir')
 install_includedir = get_option('includedir')
 install_libdir = get_option('libdir')
 install_datadir = get_option('datadir')
-install_pkgconfigdir = install_libdir / 'pkgconfig'
+install_pkgconfigdir = install_prefix / 'libdata' / 'pkgconfig'
 
 # Dependencies.
 # atkmm_build_dep: Dependencies when building the atkmm library.