key.dns_resolver parses DNS replies with the BIND ns_* API from libresolv,
which llvm-libc does not provide. It is only the upcall helper for AFS, NFS
and CIFS; libkeyutils, which is what everything else wants, still builds.

--- a/Makefile
+++ b/Makefile
@@ -100,7 +100,7 @@
 # Normal build rule
 #
 ###############################################################################
-all: keyctl request-key key.dns_resolver cxx
+all: keyctl request-key cxx
 
 ###############################################################################
 #
@@ -214,7 +214,6 @@
 	$(INSTALL) -D keyctl $(DESTDIR)$(BINDIR)/keyctl
 	$(INSTALL) -D request-key $(DESTDIR)$(SBINDIR)/request-key
 	$(INSTALL) -D request-key-debug.sh $(DESTDIR)$(SHAREDIR)/request-key-debug.sh
-	$(INSTALL) -D key.dns_resolver $(DESTDIR)$(SBINDIR)/key.dns_resolver
 	$(INSTALL) -D -m 0644 request-key.conf $(DESTDIR)$(ETCDIR)/request-key.conf
 	mkdir -p $(DESTDIR)$(ETCDIR)/request-key.d
 	mkdir -p $(DESTDIR)$(ETCDIR)/keyutils