#3 Remove Boxi autoimport warning

[Achim J. Latz]

under MingW the warning below can be avoided by changing configure-mingw.sh to have the following

LDFLAGS="-mthreads -L/usr/i686-pc-mingw32/lib -Wl,--enable-auto-import" \

$ gcc --version
gcc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)

/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/bin/ld: warning: auto-importing has been activated without --enable-auto-import specified on the command line. This should work unless it involves constant data structures referencing symbols from auto-imported DLLs.Info: resolving vtable for CppUnit::TestSetUpby linking to __imp___ZTVN7CppUnit9TestSetUpE (auto-import)