Unset `_SHORTFIN_USING_DYLIB` when building static. (#633) #1282

Job	Run time
Data-dependent Tests (3.11, llama-mi300x-3)	7m 6s
Unit Tests and Type Checking (3.11, ubuntu-latest)	1m 20s
Unit Tests and Type Checking (3.11, windows-latest)	4m 33s
	12m 59s

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