Possible fix for bug #590

This change reduces the risk of LADSPA plugins referencing
Audacity symbols by using the RTLD_DEEPBIND flag when loading
the plugins.

It also addresses an issue specific to the "blop" plugins where
they load their own libraries (without RTLD_DEEPBIND).

A much better solution would be to change Audacity's default
symbol visibility to "hidden" which would expose ONLY symbols
specificially marked as visible.

lib-src/libnyquist/nyquist/cmt/cmtcmd.h

@@ -25,7 +25,7 @@ typedef struct symb_descr {
     } ptr;
 } symb_descr_node;
 
-int lookup(char *s);
+int hash_lookup(char *s);
 void defvar(char *name, int *addr);
 void defvec(char *name, int *addr, int size);
 typedef int (*defun_type)();