Use RTLD_DEEPBIND by default.  Should really be done with a 
new function and a caller-specified flag but that got vetoed
upstream, and DEEPBIND is a good default.

--- apr-0.9.7/dso/unix/dso.c.deepbind
+++ apr-0.9.7/dso/unix/dso.c
@@ -122,7 +122,7 @@
     void *os_handle = dlopen((char *)path, RTLD_NOW | RTLD_GLOBAL);
 
 #else
-    int flags = RTLD_NOW | RTLD_GLOBAL;
+    int flags = RTLD_NOW | RTLD_GLOBAL | RTLD_DEEPBIND;
     void *os_handle;
 #ifdef _AIX
     if (strchr(path + 1, '(') && path[strlen(path) - 1] == ')')