Revert "Fix mac looking in wrong directory for libgncmod-backend-dbi.dylib."

This reverts commit 6a359f86a0.

libgnucash/backend/dbi/test/test-backend-dbi.cpp

@@ -30,9 +30,9 @@ extern "C"
 extern void test_suite_gnc_backend_dbi ();
 
 #define GNC_LIB_NAME_1 "gncmod-backend-dbi"
-#define GNC_LIB_REL_PATH_1 "gnucash"
+#define GNC_LIB_REL_PATH_1 "dbi"
 #define GNC_LIB_NAME_2 "gncmod-backend-xml"
-#define GNC_LIB_REL_PATH_2 "gnucash"
+#define GNC_LIB_REL_PATH_2 "xml"
 
 int
 main (int   argc,

libgnucash/engine/gnc-engine.c

@@ -74,10 +74,10 @@ gnc_engine_init_part2()
     } libs[] =
     {
 #if defined( HAVE_DBI_DBI_H )
-        { "gnucash", "gncmod-backend-dbi", TRUE },
+        { "dbi", "gncmod-backend-dbi", TRUE },
 #endif
-        { "gnucash", "gncmod-backend-xml", TRUE },
-        { NULL, FALSE }
+        { "xml", "gncmod-backend-xml", TRUE },
+        { NULL, NULL, FALSE }
     }, *lib;
 
     for (lib = libs; lib->lib ; lib++)