meson: Enable bluetooth modules, add bluez_util lib, add bluez and sbc dependencies

Please notice that the bluez5 version seems wrong in the dependency
declaration: `>= 4.x`, while we're talking about version 5.

The ofono part will need to be made optional when we start to work on
the meson_options file.

I follow the current configure.ac to define 'HAVE_BLUEZ', but it looks
like this part would benefit from a bit of rework. Setting HAVE_BLUEZ
when we have dbus+sbc sounds weird, there's probably a better name for
this variable.

Signed-off-by: Arnaud Rebillout <arnaud.rebillout@collabora.com>

src/modules/bluetooth/meson.build

@@ -0,0 +1,25 @@
+libbluez5_util_sources = [
+  'bluez5-util.c',
+]
+
+libbluez5_util_headers = [
+  'a2dp-codecs.h',
+  'bluez5-util.h',
+  'rtp.h',
+]
+
+if bluez_dep.found()
+  libbluez5_util_sources += [ 'backend-native.c' ]
+endif
+
+# TODO This should be optional
+libbluez5_util_sources += [ 'backend-ofono.c' ]
+
+libbluez5_util = shared_library('libbluez5_util',
+  libbluez5_util_sources,
+  libbluez5_util_headers,
+  c_args : [pa_c_args, server_c_args],
+  include_directories : [configinc, topinc],
+  dependencies : [libpulse_dep, libpulsecommon_dep, libpulsecore_dep, dbus_dep],
+  install : true
+)