fix: return if `DynamicLibrary.open` succeeds (#619) #170

Job	Run time
Android (audio libs)	4m 13s
iOS (audio libs)	10m 17s
Linux (audio libs)	2m 2s
Android	4m 1s
macOS (audio libs)	6m 11s
Windows (audio libs)	3m 15s
iOS	11m 11s
Linux	2m 31s
macOS	4m 45s
package:media_kit tests (Linux)	36m 39s
package:media_kit tests (Web)	31m 33s
package:media_kit tests (Windows)	37m 59s
Android (optional libs)	4m 25s
iOS (optional libs)	8m 11s
Linux (optional libs)	1m 58s
macOS (optional libs)	3m 34s
Windows	4m 46s
Windows (optional libs)	3m 9s
	3h 0m 40s

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