Signed-off-by: Dmitry Ponyatov <dponyatov@gmail.com>
+ rework for building on CYGWIN (coLinux not works on win x64 :(

Signed-off-by: Dmitry Ponyatov <dponyatov@gmail.com>
+ cygwin download croscc libs (gmp mpfr mpc)

Signed-off-by: Dmitry Ponyatov <dponyatov@gmail.com>