Allow building against a single dynamic swift-syntax library 🚥#851 #852
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Depends on #851
When
SWIFTSYNTAX_BUILD_DYNAMIC_LIBRARYis specified, change swift-syntax dependencies to depend on a single_SwiftSyntaxDynamicproduct instead of separate products for each module.This allows us to build SourceKit-LSP on Windows using SwiftPM without exceeding the maximum symbol limit and thus run SourceKit-LSP tests on Windows.
See swiftlang/sourcekit-lsp#1754 and swiftlang/swift-syntax#2879.