Convert most of the stub macros in timer.h and workqueue.h to static
inline functions for better type checking. Keep macros for functions
that take callback pointers (setup_timer, timer_setup, INIT_WORK,
INIT_DELAYED_WORK, del_timer_sync) since some callers pass functions
that are conditionally compiled out.
Fixes: 3b4667ed88 ("ext4l: Add super.c to build")
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