Fix dup modmaps taking into account macro test targets. #8524
+105
−73
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In my previous attempt to fix the duplicate modulemaps from C library dependencies of macros/plugins and destination targets, I didn't take into account test targets depending on macros, i.e. macro tests. In these cases the modulemap flags do need to pass through to the tests. This was discovered in swift-foundation which couldn't find the _SwiftSyntaxCShims module map.
Fixed this my moving the traversing link dependencies a layer lower since we need access to the parent node during traversal and this is available in the successor methods. Cleaned up my previous attempt.