targets: add esp32s3-supermini

[gandarez]

This PR adds support for ESP32S3-SuperMini board.

[deadprogram]

Something not quite right here @gandarez perhaps you need to rebase this branch against the latest dev?

[gandarez]

@deadprogram rebased and still fails, any thoughts?

# esp32s3-supermini
/go/bin/tinygo build -size short -o test.bin -target=esp32s3-supermini      examples/blinky1
No available targets are compatible with triple "xtensa"
make: *** [GNUmakefile:923: smoketest] Error 1

[deadprogram]

@deadprogram rebased and still fails, any thoughts?

# esp32s3-supermini
/go/bin/tinygo build -size short -o test.bin -target=esp32s3-supermini      examples/blinky1
No available targets are compatible with triple "xtensa"
make: *** [GNUmakefile:923: smoketest] Error 1

Yes. You need to move those tests inside the $XTENSA flags: https://github.com/gandarez/tinygo/blob/f9dc46c9e1f833f89d56113f5971301671f0a3d4/GNUmakefile#L915-L954

[deadprogram]

Looks good @gandarez thanks for the addition. Now merging.