build: remove SWIFT_NEED_EXPLICIT_LIBDISPATCH
(NFC)
#28338
Merged
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This flag was being used as an alias for whether or not the host is
non-Darwin. Rather than adding custom checks for this, use the explicit
check that CMake supports. This simplifies the logic and avoids the
proliferation of custom variables which can become confusing for others
who are not familiar with the custom build infrastructure.
Replace this paragraph with a description of your changes and rationale. Provide links to external references/discussions if appropriate.
Resolves SR-NNNN.