Automake doesn't know how to compile a single file both with and without
libtool.  So fake it.

Index: b/src/Makefile.am
===================================================================
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -28,8 +28,11 @@
 libnss_db_la_LIBADD = @DB_LIBS@ -lnss_files
 
 bin_PROGRAMS = makedb
-makedb_SOURCES = makedb.c db-compat.c
+makedb_SOURCES = makedb.c db-compat-copy-makedb.c
 makedb_LDADD = @DB_LIBS@ @LIBINTL@ @SELINUX_LIBS@
+db-compat-copy-makedb.c: db-compat.c
+	cp $^ $@
+	chmod -w $@
 
 # To mimmick the old glibc installation as closely as possible, we
 # shuffle the installed library and the links to it around a bit,