Dealt with the gcc 4.4 expression for it to work well for a native and a cross
compiler, adding a pair of patches to get the job done without much side
effects. One (libtool problems on -B) comes from the gcc 4.3 expression, while
the other fixes a bug already fixed in gcc 4.4.3.
svn path=/nixpkgs/branches/stdenv-updates/; revision=18833
