this is a trivial no-op, because dlclose never deletes libraries. thus
we might as well have it in the header in case some application wants
it, since we're already providing it anyway.
#define RTLD_LAZY 1
#define RTLD_NOW 2
#define RTLD_NOLOAD 4
#define RTLD_LAZY 1
#define RTLD_NOW 2
#define RTLD_NOLOAD 4
+#define RTLD_NODELETE 4096
#define RTLD_GLOBAL 256
#define RTLD_LOCAL 0
#define RTLD_GLOBAL 256
#define RTLD_LOCAL 0