Don't install any default configuration file

/etc/kamailio won't be populated nor created.

Makefile

@@ -884,7 +884,7 @@ sunpkg:
 
 .PHONY: install
 install: mk_params="compile_for_install=yes"
-install: install-bin install-every-module install-cfg \
+install: install-bin install-every-module  \
 	install-doc install-man install-utils install-share
 
 .PHONY: dbinstall

utils/kamctl/Makefile

@@ -8,7 +8,7 @@ all:
 
 install-if-newer: install
 
-install: install-cfg install-bin install-man install-modules
+install:  install-bin install-man install-modules
 
 install-cfg: $(cfg_prefix)/$(cfg_dir)
 		# kamctl config