build-sys: add libfido2 as optional dependency

meson.build

@@ -1153,6 +1153,17 @@ else
 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',
@@ -3575,6 +3586,7 @@ foreach tuple : [
         ['pwquality'],
         ['libfdisk'],
         ['p11kit'],
+        ['libfido2'],
         ['AUDIT'],
         ['IMA'],
         ['AppArmor'],

meson_options.txt

@@ -312,6 +312,8 @@ option('openssl', 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'],