add TARGET_SYSTEM_EMULATOR for windows builds in linux
add TARGET_SYSTEM_EMULATOR for windows builds in linux

milagro-crypto/milagro-crypto-c,miracl/milagro-crypto-c,miracl/milagro-crypto-c,philipp-cliqz/milagro-crypto-c,philipp-cliqz/milagro-crypto-c,milagro-crypto/milagro-crypto-c,milagro-crypto/milagro-crypto-c,miracl/milagro-crypto-c,milagro-crypto/milagro-crypto-c,miracl/milagro-crypto-c,philipp-cliqz/milagro-crypto-c,philipp-cliqz/milagro-crypto-c,miracl/milagro-crypto-c