test for board type in build_jswrapper.py

python scripts/build_jswrapper.py src/jswrap_array.c src/jswrap_arraybuffer.c src/jswrap_date.c src/jswrap_error.c src/jswrap_espruino.c src/jswrap_flash.c src/jswrap_functions.c src/jswrap_interactive.c src/jswrap_io.c src/jswrap_json.c src/jswrap_modules.c src/jswrap_pin.c src/jswrap_number.c src/jswrap_object.c src/jswrap_onewire.c src/jswrap_pipe.c src/jswrap_process.c src/jswrap_serial.c src/jswrap_spi_i2c.c src/jswrap_stream.c src/jswrap_string.c src/jswrap_waveform.c libs/math/jswrap_math.c libs/network/jswrap_net.c libs/network/http/jswrap_http.c libs/network/js/jswrap_jsnetwork.c libs/network/esp8266/jswrap_esp8266_netw­ork.c targets/esp8266/jswrap_esp8266.c targets/esp8266/jswrap_nodemcu.c libs/network/telnet/jswrap_telnet.c libs/crypto/jswrap_crypto.c -DGIT_COMMIT=682807245a4f21ffc5fd48502d8­4c22e23194ffd -DBUILDNUMBER="41" -DUSE_DEBUGGER -DUSE_TAB_COMPLETE -DUSE_HEATSHRINK -DUSE_MATH -DUSE_NET -DUSE_ESP8266 -DUSE_TELNET -DUSE_CRYPTO -DUSE_OPTIMIZE_PRINTF -D__ETS__ -DICACHE_FLASH -DXTENSA -DUSE_US_TIMER -DEMBEDDED -DESP8266 -BESP8266_BOARD

Reading up on the getopt module....