What is a standard

Compiling related fixes and such:

• D__USE_MINGW_ANSI_STDIO=0 is no longer defined because modern MinGW versions don't like it (this needs testing to make sure it doesn't break anything in older versions or such)
• socklen_t in mserv.c is no longer redundantly defined for MinGW
• also added tabbing and made other tweaks to i_tcp.c and mserv.c in general

WIP because this needs testing and I may add more later