38c32400f5
An `extern LIB "csym"` ref must name a declared #library / #import c unit, like its `#foreign LIB` twin (example 1620). Today checkForeignRefs reads only foreign_expr.library_ref and skips the extern keyword's extern_lib, so a bogus `extern nosuchunit "abs"` compiles silently (the symbol resolves via the default image and runs). Expected pins the DESIRED compile-time diagnostic; the next commit extends checkForeignRefs to green it. Fourth extern/#foreign divergence and a prerequisite for the fn-decl migration. 647 corpus (1231 xfail), 444 unit.
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