[uClibc] static linking aid: dummy libdl

[Bennett Todd]

I'm finding that almost all apps are happy to build and run in a
purely statically linked environment, one with no support for
dynamic libs at all.

Occasionally, though, I find one that's got libdl invocations wired
into it.

Rather than patching, I've found that this libdl.c:

	void *dlopen(const char *filename, int flag){return (void *)0;}
	const char *dlerror(void){return (char *)0;}
	void *dlsym(void *handle, char *symbol){return (void *)0;}
	int dlclose(void *handle){return 0;}

suffices to make 'em link and stop whinging, and as long as the
dynamic loading functionality is operationally optional, the
result seems to work fine.

-Bennett
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