cf: Add --with-mitdb=PATH option

OS X builds started thinking they have the mitdb backend and started
failing the tests/kdc/check-mitdb test.  This commit fixes that by
requiring explicit enablement of the mitdb HDB backend.

lib/hdb/Makefile.am

@@ -84,6 +84,11 @@ if versionscript
 libhdb_la_LDFLAGS += $(LDFLAGS_VERSION_SCRIPT)$(srcdir)/version-script.map
 endif
 
+if HAVE_MITDB
+libhdb_la_LDFLAGS += -L$(MITDB)/lib -Wl,-rpath,$(MITDB)/lib -ldb
+AM_CPPFLAGS += -I$(MITDB)/include
+endif
+
 # test_hdbkeys and test_mkey are not tests -- they are manual test utils
 noinst_PROGRAMS = test_dbinfo test_hdbkeys test_mkey test_namespace test_concurrency
 TESTS = test_dbinfo test_namespace test_concurrency

lib/hdb/hdb-mitdb.c

@@ -118,7 +118,7 @@ attr_to_flags(unsigned attr, HDBFlags *flags)
 
 #define CHECK(x) do { if ((x)) goto out; } while(0)
 
-#ifdef HAVE_DB1
+#ifdef HAVE_MITDB
 static krb5_error_code
 mdb_principal2key(krb5_context context,
 		  krb5_const_principal principal,
@@ -134,7 +134,7 @@ mdb_principal2key(krb5_context context,
     key->length = strlen(str) + 1;
     return 0;
 }
-#endif /* HAVE_DB1 */
+#endif /* HAVE_MITDB */
 
 #define KRB5_KDB_SALTTYPE_NORMAL	0
 #define KRB5_KDB_SALTTYPE_V4		1
@@ -675,11 +675,11 @@ mdb_entry2value(krb5_context context, hdb_entry *entry, krb5_data *data)
 }
 #endif
 
-#if HAVE_DB1
+#ifdef HAVE_MITDB
 
 #if defined(HAVE_DB_185_H)
 #include <db_185.h>
-#elif defined(HAVE_DB_H)
+#else
 #include <db.h>
 #endif
 
@@ -1154,7 +1154,7 @@ hdb_mitdb_create(krb5_context context, HDB **db,
     return 0;
 }
 
-#endif /* HAVE_DB1 */
+#endif /* HAVE_MITDB */
 
 /*
 can have any number of princ stanzas.

lib/hdb/hdb.c

@@ -77,7 +77,7 @@ static struct hdb_method methods[] = {
 #if HAVE_DB3
     { HDB_INTERFACE_VERSION, NULL, NULL, 1, 1, "db3:",	hdb_db3_create},
 #endif
-#if HAVE_DB1
+#if HAVE_MITDB
     { HDB_INTERFACE_VERSION, NULL, NULL, 1, 1, "mit-db:",	hdb_mitdb_create},
 #endif
 #if HAVE_LMDB