meson.build: Group the network backend entries in a separate summary section

Let's make it easier for the users to spot network-related entries
in the summary of the meson output.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230602171832.533739-3-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

meson.build

@@ -4251,12 +4251,19 @@ summary_info += {'curses support':    curses}
 summary_info += {'brlapi support':    brlapi}
 summary(summary_info, bool_yn: true, section: 'User interface')
 
-# Libraries
+# Network backends
 summary_info = {}
 if targetos == 'darwin'
   summary_info += {'vmnet.framework support': vmnet}
 endif
 summary_info += {'slirp support':     slirp}
+summary_info += {'vde support':       vde}
+summary_info += {'netmap support':    have_netmap}
+summary_info += {'l2tpv3 support':    have_l2tpv3}
+summary(summary_info, bool_yn: true, section: 'Network backends')
+
+# Libraries
+summary_info = {}
 summary_info += {'libtasn1':          tasn1}
 summary_info += {'PAM':               pam}
 summary_info += {'iconv support':     iconv}
@@ -4278,9 +4285,6 @@ if targetos == 'linux'
 endif
 summary_info += {'Pipewire support':   pipewire}
 summary_info += {'JACK support':      jack}
-summary_info += {'vde support':       vde}
-summary_info += {'netmap support':    have_netmap}
-summary_info += {'l2tpv3 support':    have_l2tpv3}
 summary_info += {'Linux AIO support': libaio}
 summary_info += {'Linux io_uring support': linux_io_uring}
 summary_info += {'ATTR/XATTR support': libattr}