The newest mingw runtime (3.15) on sourceforge apparently uses the
libgdtoa library for internal purposes. Someone spent the time to
rename almost all of the symbols in it, but they missed one:
_hexdig_init_D2A should be ___hexdig_init_D2A. This causes us problems
because we also link to libgdtoa and this one overlooked function
collides and causes a linker error.
Is there any way to disable linking against mingwex as a work-around for now?