This is basically the previous ebuild with "3.3.1" replaced with "3.4.1". Since it is only trivially different from the previous version there shouldn't be any problems.
Created attachment 35909 [details] xmingw-gcc-3.4.1.ebuild
Created attachment 35910 [details] files/gcc-3.4.1-includefix.diff
*** Bug 62033 has been marked as a duplicate of this bug. ***
Added to portage, many thanks