With just 'inline', if the compiler decides not to inline them, it isn't
required to emit them at all. For some targets with -Os that is causing
build failures, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86360.
Perhaps we might consider using '__attribute__((always_inline))' for
GCC builds, but 'static inline' is a good start.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
