Simplify generation of pkgconfig file

Use meson's pkgconfig module to generate the pkg-config file, rather
than using old-school autotools patterns.

meson.build

@@ -182,17 +182,6 @@ pkg_cdata.set('exec_prefix', '${prefix}')
 pkg_cdata.set('libdir', '${prefix}/@0@'.format(get_option('libdir')))
 pkg_cdata.set('includedir', '${prefix}/@0@'.format(get_option('includedir')))
 pkg_cdata.set('VERSION', mdns_version)
-pkg_cdata.set('LIBSOCKET', host_system == 'windows' ? '-lws2_32 -liphlpapi': '')
-
-pkg_install_dir = '@0@/pkgconfig'.format(get_option('libdir'))
-
-configure_file(
-    input: 'src/microdns.pc.in',
-    output: 'microdns.pc',
-    configuration: pkg_cdata,
-    install_dir: pkg_install_dir,
-    install: true,
-)
 
 mdns_dep = declare_dependency(link_with : libmicrodns,
     include_directories : incdirs,

src/meson.build

@@ -19,3 +19,12 @@ libmicrodns = library('microdns', libmicrodns_sources,
     soversion: mdns_soversion,
     version: mdns_soname_version,
 )
+
+pkgconf = import('pkgconfig')
+pkgconf.generate(libraries: libmicrodns,
+                 version: mdns_version,
+                 name: 'microDNS',
+                 description: 'mDNS simple implementation',
+                 filebase: 'microdns',
+                 requires: deps,
+)