BundleUtilities: Work w/ non .app exes on Mac (#12034)

Also add a test of BundleUtilities including an exe,
some shared libs, a plugin, and a framework-style lib.

This test presently runs (and this functionality works)
on Linux, Mac and Windows.

For now, the framework-style lib is built as a plain old
shared lib because there is another yet-unresolved issue
with local frameworks without rpaths on the Mac.

Tests/BundleUtilities/module.cpp

@@ -0,0 +1,10 @@
+
+#include "module.h"
+#include "stdio.h"
+#include "shared2.h"
+
+void module()
+{
+  printf("module\n");
+  shared2();
+}