build: Do not use deprecated meson object functions

data/meson.build

@@ -27,7 +27,7 @@ polkit_policy = 'net.reactivated.fprint.device.policy'
 polkit_policy_target = i18n.merge_file(
     input: '@0@.in'.format(polkit_policy),
     output: polkit_policy,
-    po_dir: meson.source_root() / 'po',
+    po_dir: meson.project_source_root() / 'po',
     install: true,
     install_dir: polkit_policy_directory,
 )

meson.build

@@ -6,7 +6,7 @@ project('fprintd', 'c',
         'warning_level=3',
         'c_std=gnu99',
     ],
-    meson_version: '>= 0.50.0')
+    meson_version: '>= 0.56.0')
 
 gnome = import('gnome')
 i18n = import('i18n')

tests/meson.build

@@ -31,8 +31,8 @@ foreach t: tests
             'env': [
                 'G_DEBUG=fatal-criticals',
                 'G_MESSAGES_DEBUG=all',
-                'FPRINT_BUILD_DIR=' + meson.build_root() / 'src',
-                'TOPSRCDIR=' + meson.source_root(),
+                'FPRINT_BUILD_DIR=' + meson.project_build_root() / 'src',
+                'TOPSRCDIR=' + meson.project_source_root(),
             ],
             'depends': [
                 fprintd,
@@ -75,7 +75,7 @@ foreach pt: python_tests
             args: ut_args,
             suite: ut_suite,
             depends: pt.get('depends', []),
-            workdir: pt.get('workdir', meson.build_root()),
+            workdir: pt.get('workdir', meson.project_build_root()),
             env: pt.get('env', []),
             timeout: pt.get('timeout', 30),
             is_parallel: pt.get('is_parallel', true),

tests/pam/meson.build

@@ -49,8 +49,8 @@ foreach t: tests
             'file': files(meson.current_source_dir() / t + '.py')[0],
             'is_parallel': false,
             'env': [
-                'TOPBUILDDIR=' + meson.build_root(),
-                'TOPSRCDIR=' + meson.source_root(),
+                'TOPBUILDDIR=' + meson.project_build_root(),
+                'TOPSRCDIR=' + meson.project_source_root(),
                 'LD_PRELOAD=' + ' '.join(pam_tests_ld_preload),
                 'PAM_WRAPPER=1',
                 'PAM_WRAPPER_DEBUGLEVEL=2',