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Newlib has a build configuration where syscalls can be directly embedded in the newlib library rather than relying on libgloss. This configuration was broken recently by an update to the libgloss support for Arm that was not propagated to the syscalls interface in newlib itself. This patch restores the build. It's essentially a copy of https://sourceware.org/ml/newlib/2018/msg00128.html but there are some other minor cleanups and changes that I've made at the same time. None of those cleanups affect functionality. The prototypes of the following functions have been updated: _link, _sbrk, _getpid, _write, _swiwrite, _lseek, _swilseek, _read and _swiread. Signed-off-by: Richard Earnshaw <Richard.Earnshaw@arm.com>
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