[http]
[http]

More makefile work:

* Add show and show: targets to help with debugging make variables.
* Enumerate assemblies in EXE_TARGETS or DLL_TARGETS as the rules are evaluated.
* TARGETS contains the union of $(EXE_TARGETS) and $(DLL_TARGETS)
* all now depends on $(EXE_TARGETS), so new executing assemblies will automatically get built.

stdjon/httplib,stdjon/httplib