F_SETLKW64 and F_SETLK64 are defined in
include/asm-generic/fcntl.h on musl target
but just including this header does not work
since both include/asm-generic/fcntl.h and include/fcntl.h
define same structures resulting in
conflicting declaration of structs.
Having local definitions of these values seems reasonable here.
Signed-off-by: Khem Raj <raj.khem@gmail.com>