Fix Makefile syntax error
Fix Makefile syntax error

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