build: allow building on Linux without Swift_FLAGS #3117
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When CMAKE_Swift_FLAGS is empty, the string substitution will be empty, resulting in insufficient parameters to the REPLACE operation. The quoting ensures that an empty string does not cause that failure.
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@swift-ci please test |
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When CMAKE_Swift_FLAGS is empty, the string substitution will be empty,
resulting in insufficient parameters to the REPLACE operation. The
quoting ensures that an empty string does not cause that failure.