unwind: give all exported functions "unwind_" prefix
* unwind.c (init_unwind_addr_space): Rename to unwind_init. (init_libunwind_ui): Rename to unwind_tcb_init. (free_libunwind_ui): Rename to unwind_tcb_fin. (delete_mmap_cache): Rename to unwind_cache_invalidate. (print_stacktrace): Rename to unwind_print_stacktrace. * defs.h: Update prototypes. * mem.c: All callers updated. * process.c: Likewise. * strace.c: Likewise. * syscall.c: Likewise. Signed-off-by: Masatake YAMATO <yamato@redhat.com>
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