gnu: blueman: Update package definition.

gnu: blueman: Update package definition.

* gnu/packages/networking.scm (blueman): Fixes.
[version]: Upgrade to 2.1.3.
[source]<origin>[method]: Change from url-fetch to git-fetch.
[arguments]<#:phases>['setenv]: New phase.
['patch-python-references]: New phase.
['patch-external-programs]: New phase.
['patch-pulseaudio-libraries]: New phase.
['wrap-blueman-progs]: New phase.
[native-inputs]: Add autoconf, autogen, automake and gobject-introspection.
[inputs]: Add iptables and ppp. Remove adwaita-icon-theme.

Signed-off-by: Pierre Neidhardt <mail@ambrevar.xyz>