Don't turn on breakpoints when library is added

- this likely breaks tracing from libraries on x86s, but fixes ppc base
  binary tracing for non-secure ppc32 cases.  We'll need to tweak this
  to enable the library PLTs
diff --git a/proc.c b/proc.c
index 8c42c4a..7568a75 100644
--- a/proc.c
+++ b/proc.c
@@ -487,9 +487,20 @@
 {
 	struct Process *proc = data;
 
-	if (filter_matches_symbol(options.filter, libsym)
-	    && insert_breakpoint(proc, libsym->enter_addr, libsym) == NULL)
-		return CBS_STOP;
+	if (!filter_matches_symbol(options.filter, libsym))
+		return CBS_CONT;
+
+	struct breakpoint *bp = malloc(sizeof(*bp));
+	if (bp == NULL
+	    || breakpoint_init(bp, proc, libsym->enter_addr, libsym) < 0) {
+	fail:
+		free(bp);
+		return CBS_FAIL;
+	}
+	if (proc_add_breakpoint(proc, bp) < 0) {
+		breakpoint_destroy(bp);
+		goto fail;
+	}
 
 	return CBS_CONT;
 }