contrib: add iax2 rules

Change-Id: Ic9014b322c9fcdd68823a2bcbbb00af87ee69690
Refs: #46617

contrib/src/iax/rules.mak

+#IAX
+
+IAX_URL = https://gitlab.savoirfairelinux.com/sflphone/libiax2.git
+
+PKGS += iax
+
+$(TARBALLS)/iax-git.tar.xz:
+	$(call download_git,$(IAX_URL))
+
+.sum-iax: iax-git.tar.xz
+	$(warning $@ not implemented)
+	touch $@
+
+iax: iax-git.tar.xz .sum-iax
+	$(UNPACK)
+	$(MOVE)
+
+.iax: iax
+	$(RECONF)
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
+	cd $< && $(MAKE) install
+	touch $@