build-sys: add libfido2 as optional dependency

meson.build

@@ -1347,6 +1347,17 @@ conf.set10('HAVE_PAM', have)
 # endif
 # conf.set10('HAVE_P11KIT', have)
 #
+# want_libfido2 = get_option('libfido2')
+# if want_libfido2 != 'false' and not skip_deps
+#         libfido2 = dependency('libfido2',
+#                               required : want_libfido2 == 'true')
+#         have = libfido2.found()
+# else
+#         have = false
+#         libfido2 = []
+# endif
+# conf.set10('HAVE_LIBFIDO2', have)
+#
 # want_elfutils = get_option('elfutils')
 # if want_elfutils != 'false' and not skip_deps
 #         libdw = dependency('libdw',
@@ -4042,6 +4053,7 @@ foreach tuple : [
 #         ['libfdisk'],
 #endif // 0
         ['p11kit'],
+        ['libfido2'],
         ['AUDIT'],
 #if 0 /// UNNEEDED by elogind
 #         ['IMA'],

meson_options.txt

@@ -385,6 +385,8 @@ option('pam', type : 'combo', choices : ['auto', 'true', 'false'],
 #        description : 'openssl support')
 # option('p11kit', type : 'combo', choices : ['auto', 'true', 'false'],
 #        description : 'p11kit support')
+# option('libfido2', type : 'combo', choices : ['auto', 'true', 'false'],
+#        description : 'FIDO2 support')
 # option('elfutils', type : 'combo', choices : ['auto', 'true', 'false'],
 #        description : 'elfutils support')
 # option('zlib', type : 'combo', choices : ['auto', 'true', 'false'],