build: Add meson build system

Reuse the generated dbus interface .xml files from fprintd to avoid
unnecessary copies.

pam/meson.build

@@ -0,0 +1,27 @@
+mapfile = files('pam_fprintd.ver')
+pam_modules_dir = '/' + get_option('libdir') / 'security'
+
+pam_fprintd = shared_module('pam_fprintd',
+    name_prefix: '',
+    include_directories: [
+        include_directories('..'),
+    ],
+    sources: [
+        'pam_fprintd.c',
+        'fingerprint-strings.h',
+    ],
+    dependencies: [
+        libsystemd_dep,
+        pam_dep,
+    ],
+    c_args: [
+        '-DLOCALEDIR="@0@"'.format(localedir),
+    ],
+    link_args: [
+        '-Wl,--version-script,@0@/@1@'.format(meson.source_root(), mapfile[0]),
+        '-Wl,--unresolved-symbols=report-all',
+    ],
+    link_depends: mapfile,
+    install: true,
+    install_dir: pam_modules_dir,
+)