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This reverts commit 837b94df.

media_localip is guessed from signaling using call->dest_proxy. This ease the use of liblinphone on a machine with two interfaces (typically a one being a vpn).
Clean things around sal.c and sal_impl.c

# Conflicts:
#	CMakeLists.txt
#	coreapi/account_creator.c
#	coreapi/friendlist.c
#	coreapi/linphonecore_jni.cc
#	coreapi/misc.c
#	coreapi/vcard.cc
#	coreapi/vcard.h
#	coreapi/vcard_stubs.c
#	gtk/videowindow.c
#	java/common/org/linphone/core/LinphoneNatPolicy.java
#	java/impl/org/linphone/core/LinphoneNatPolicyImpl.java
#	mediastreamer2
#	tester/vcard_tester.c

This reverts commit 28ced75b.