meson: Fix CFLAGS use by using add_project_arguments

It seems that meson will not always apply the CFLAGS as defined through
the environment if "c_args=" is used in the default_options array for
the project() call.

Switching to add_project_arguments solves this problem.

See https://github.com/mesonbuild/meson/issues/8037

meson.build

@@ -5,7 +5,14 @@ project('fprintd', 'c',
         'buildtype=debugoptimized',
         'warning_level=1',
         'c_std=gnu99',
-        'c_args=' + ' '.join([
+    ],
+    meson_version: '>= 0.50.0')
+
+gnome = import('gnome')
+i18n = import('i18n')
+
+cc = meson.get_compiler('c')
+common_cflags = cc.get_supported_arguments([
     '-fno-strict-aliasing',
     '-Wall',
     '-Wcast-align',
@@ -43,14 +50,9 @@ project('fprintd', 'c',
     '-Wtype-limits',
     '-Wundef',
     '-Wunused',
-        ]),
-    ],
-    meson_version: '>= 0.50.0')
+])
+add_project_arguments(common_cflags, language: 'c')
 
-gnome = import('gnome')
-i18n = import('i18n')
-
-cc = meson.get_compiler('c')
 host_system = host_machine.system()
 glib_min_version = '2.56'
 libfprint_min_version = '1.90.1'