[Debian GNUstep maintainers] Bug#451458: patch for mingw32 to enable building of libgcc_s

[Luke Kenneth Casson Leighton]

This patch enables building libgcc_s as a DLL on MinGW and Cygwin. This
allows throwing exceptions across DLL boundaries when using a shared
libgcc_s.
http://archives.free.net.ph/message/20080818.185009.87903ba6.en.html

pleaase dooo iincluuude iiiiit :)  24 hours of building webkit cross-compiled
for win32 and _now_ i find there's no -lgcc_s...