Avoid "inline" after return type in function definitions.

Avoid "inline" after return type in function definitions.

One group of warnings seen with -Wextra is warnings for static or
inline not at the start of a declaration (-Wold-style-declaration).

This patch fixes various such cases for inline, ensuring it comes at
the start of the declaration (after any static).  A common case of the
fix is "static inline <type> __always_inline"; the definition of
__always_inline starts with __inline, so the natural change is to
"static __always_inline <type>".  Other cases of the warning may be
harder to fix (one pattern is a function definition that gets
rewritten to be static by an including file, "#define funcname static
wrapped_funcname" or similar), but it seems worth fixing these cases
with inline anyway.

Tested for x86_64.

	* elf/dl-load.h (_dl_postprocess_loadcmd): Use __always_inline
	before return type, without separate inline.
	* elf/dl-tunables.c (maybe_enable_malloc_check): Likewise.
	* elf/dl-tunables.h (tunable_is_name): Likewise.
	* malloc/malloc.c (do_set_trim_threshold): Likewise.
	(do_set_top_pad): Likewise.
	(do_set_mmap_threshold): Likewise.
	(do_set_mmaps_max): Likewise.
	(do_set_mallopt_check): Likewise.
	(do_set_perturb_byte): Likewise.
	(do_set_arena_test): Likewise.
	(do_set_arena_max): Likewise.
	(do_set_tcache_max): Likewise.
	(do_set_tcache_count): Likewise.
	(do_set_tcache_unsorted_limit): Likewise.
	* nis/nis_subr.c (count_dots): Likewise.
	* nptl/allocatestack.c (advise_stack_range): Likewise.
	* sysdeps/ieee754/dbl-64/s_sin.c (do_cos): Likewise.
	(do_sin): Likewise.
	(reduce_sincos): Likewise.
	(do_sincos): Likewise.
	* sysdeps/unix/sysv/linux/x86/elision-conf.c
	(do_set_elision_enable): Likewise.
	(TUNABLE_CALLBACK_FNDECL): Likewise.