Two options off the top of my head.
Y-jack for the 2 mic inputs. (you would not have individual volume control on the mics)
Dual sound card. (You would have to use the soundcards software for individual volume control adding CPU/Memory overhead)
Small unpowered mixer. This would be my choice. You can get a small 2 channel mixer not much bigger than a paperback book.
Okay, that was 3 options.
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Test machine:
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