configure, meson: convert libcacard detection to meson

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/meson.build b/meson.build
index 0b4b55b..afcfcb8 100644
--- a/meson.build
+++ b/meson.build
@@ -976,9 +976,10 @@
                            link_args: config_host['XEN_LIBS'].split())
 endif
 cacard = not_found
-if 'CONFIG_SMARTCARD' in config_host
-  cacard = declare_dependency(compile_args: config_host['SMARTCARD_CFLAGS'].split(),
-                              link_args: config_host['SMARTCARD_LIBS'].split())
+if not get_option('smartcard').auto() or have_system
+  cacard = dependency('libcacard', required: get_option('smartcard'),
+                      version: '>=2.5.1', method: 'pkg-config',
+                      kwargs: static_kwargs)
 endif
 u2f = not_found
 if have_system
@@ -2781,7 +2782,7 @@
 summary_info += {'spice support':     config_host.has_key('CONFIG_SPICE')}
 summary_info += {'rbd support':       rbd.found()}
 summary_info += {'xfsctl support':    config_host.has_key('CONFIG_XFS')}
-summary_info += {'smartcard support': config_host.has_key('CONFIG_SMARTCARD')}
+summary_info += {'smartcard support': cacard.found()}
 summary_info += {'U2F support':       u2f.found()}
 summary_info += {'libusb':            libusb.found()}
 summary_info += {'usb net redir':     config_host.has_key('CONFIG_USB_REDIR')}