cmd/gomobile: have pkgImportsAudio look for exp/audio/al, not exp/audio.
cmd/gomobile: have pkgImportsAudio look for exp/audio/al, not exp/audio.

An app could conceivably import the former without importing the latter.

Change-Id: I7b0e13fe7d9e6d9e586fa2edf00811330be2a9b7
Reviewed-on: https://go-review.googlesource.com/11607
Reviewed-by: Hyang-Ah Hana Kim <d7e82c3c07f92613bcbf9a1e88f6b96c13caa3b0@gmail.com>

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