configure, meson: Migrate libpcap check to meson

configure

@@ -1562,20 +1562,6 @@ if test "$opengl" != "no" ; then
   QEMU_CFLAGS="$QEMU_CFLAGS $opengl_cflags"
 fi # test "$opengl" != "no"
 
-##########################################
-# libpcap probe
-if test "$mingw32" = "yes"; then
-  libpcap_cflags="-I$source_path/winpcap-loader/include"
-  libpcap_libs="-lws2_32"
-else
-  if $pkg_config --exists "libpcap"; then
-    libpcap_cflags=$($pkg_config --cflags libpcap)
-    libpcap_libs=$($pkg_config --libs libpcap)
-  else
-    feature_not_found "libpcap" "Install libpcap"
-  fi
-fi
-
 ##########################################
 # libsamplerate probe
 if $pkg_config --exists samplerate; then
@@ -2426,9 +2412,6 @@ if test "$have_tsan" = "yes" && test "$have_tsan_iface_fiber" = "yes" ; then
     echo "CONFIG_TSAN=y" >> $config_host_mak
 fi
 
-echo "LIBPCAP_CFLAGS=$libpcap_cflags" >> $config_host_mak
-echo "LIBPCAP_LIBS=$libpcap_libs" >> $config_host_mak
-
 echo "LIBSAMPLERATE_CFLAGS=$libsamplerate_cflags" >> $config_host_mak
 echo "LIBSAMPLERATE_LIBS=$libsamplerate_libs" >> $config_host_mak
 

meson.build

@@ -1186,8 +1186,15 @@ openssl = dependency('openssl',
                      required: true,
                      kwargs: static_kwargs)
 
-libpcap = declare_dependency(compile_args: config_host['LIBPCAP_CFLAGS'].split(),
-                             link_args: config_host['LIBPCAP_LIBS'].split())
+if targetos == 'windows'
+  libpcap = declare_dependency(include_directories: 'winpcap-loader/include',
+                               link_args: ['-lws2_32'])
+else
+  libpcap = dependency('libpcap',
+                       method: 'pkg-config',
+                       required: true,
+                       kwargs: static_kwargs)
+endif
 
 libsamplerate = declare_dependency(compile_args: config_host['LIBSAMPLERATE_CFLAGS'].split(),
                                    link_args: config_host['LIBSAMPLERATE_LIBS'].split())