Adjust search logic for std.* modules

1. Don't do fuzzy match for std.* modules (more precisely, for 'std'
   and std.*). This means if we want to build a std.* module, we have
   to specify its name explicitly:

   mxx{std-core}@./: cc.module_name = std.core

   The idea is that we don't want, say, std.core to be fuzzy-matched
   to some unrelated core.mxx while #2 below could have done the right
   thing.

2. We allow such modules to go unresolved with the assumption that they
   are pre-built and will be found by other means (e.g., VC's IFCPATH).

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