remove the autoconf+Make buildsystem

We're not using it anymore. Any leftover bugs in the Meson buildsystem
are now just bugs.

Closes #249.

Change-Id: I0465a0c37ae819f94d40e7829f5bff046aa63d73

src/libutil/local.mk

@@ -1,18 +0,0 @@
-libraries += libutil
-
-libutil_NAME = libnixutil
-
-libutil_DIR := $(d)
-
-libutil_SOURCES := $(wildcard $(d)/*.cc)
-
-libutil_CXXFLAGS += -I src/libutil
-
-libutil_LDFLAGS += -pthread $(OPENSSL_LIBS) $(LIBBROTLI_LIBS) $(LIBARCHIVE_LIBS) $(BOOST_LDFLAGS) -lboost_context
-
-$(foreach i, $(wildcard $(d)/args/*.hh), \
-  $(eval $(call install-file-in, $(i), $(includedir)/nix/args, 0644)))
-
-ifeq ($(HAVE_LIBCPUID), 1)
-	libutil_LDFLAGS += -lcpuid
-endif