liblzma: Make parameter names in function definition match declaration.

liblzma: Make parameter names in function definition match declaration.

lzma_raw_encoder() and lzma_raw_encoder_init() used "options" as the
parameter name instead of "filters" (used by the declaration). "filters"
is more clear since the parameter represents the list of filters passed
to the raw encoder, each of which contains filter options.

(cherry picked from commit 27ab54af848ec4adc9c17362f6c64a42a7003df5)