Eina: fix colors messages in MSYS2

Eina: fix colors messages in MSYS2

With MSYS1 or cygwin 1.5, or DOS console, the display is done by redirecting
stdout and al. So to change the colors, the Win32 API of the console must be
used.
On the contrary, the terminals based on mintty (like cygwin 1.8 terminal or MSYS2)
the redirection is done with pipes, so the Win32 API of the console does not
work when changing the colors and we can use the POSIX colors of printf.

This patch is fixing the eina code which alwayss use the Win32 API of the console
on Windows, even if mintty-based terminals are used