patch-tool-mxe: Support .tgz, .tbz2, .txz

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
icu4c: update

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
icu4c: move DLLs to bin/

See #393.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>