* build-aux/speedo.mk (speedo_w32_cflags): Remove -mms-bitfields
because it is for a long time the gcc default. Enable control flow
protection.
--
Note that due to mingw static linking problems with libssp the stack
protector is not yet enabled.
(cherry picked from commit afe87ffc08e14317f4ef5bbe2940d07203a43808)