This change removes Gomobile's dependency on ANDROID_HOME and
ANDROID_NDK_HOME. Setting ANDROID_HOME is generally optional,
and ANDROID_NDK_HOME is deprecated.
This change also increases the minimum API version to 16, as
all SDKs that supported API 15 are now deprecated.
Fixesgolang/go#52470
Change-Id: I546365774a089e5d7ae1be0a538efd72741d92ac
Reviewed-on: https://go-review.googlesource.com/c/mobile/+/401574
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Daniel Skinner <daniel@dasa.cc>
Reviewed-by: Suzy Mueller <suzmue@golang.org>
Reviewed-by: Hajime Hoshi <hajimehoshi@gmail.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
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