This change fixes an issue that `Platform.operatingSystem` returns Android on x64 hosts and when cross-building for arm64 targets on x64 hosts. To fix the issue, use the gen_snapshot of linux and elinux instead of Android's one.
Fixed https://github.com/sony/flutter-elinux/issues/212
Signed-off-by: Hidenori Matsubayashi <[email protected]>
Also, avoid using environment variables to prevent interference to
other commands run by CMake. Only CMAKE_C(XX)_COMPILER is sufficient
to build flutter.
