build with Meson instead of autotools

So long, autotools!  This is my last MPD related project to migrate
away from it.  It has its strengths, but also very obvious weaknesses
and weirdnesses.  Today, many of its quirks are not needed anymore,
and are cumbersome and slow.  Now welcome our new Meson overlords!

src/lib/oss/meson.build

@@ -0,0 +1,15 @@
+enable_oss = get_option('oss')
+if enable_oss.disabled()
+  enable_oss = false
+elif enable_oss.auto() and alsa_dep.found()
+# don't bother auto-enabling OSS if ALSA is available
+  enable_oss = false
+elif compiler.has_header('sys/soundcard.h') or compiler.has_header('soundcard.h')
+  enable_oss = true
+elif enable_oss.auto()
+  enable_oss = false
+else
+  error('sys/soundcard.h not found')
+endif
+  
+conf.set('HAVE_OSS', enable_oss)