gst/speexresample/: Update Speex resampler with latest version from Speex GIT.

gst/speexresample/: Update Speex resampler with latest version from Speex GIT.

Original commit message from CVS:
* gst/speexresample/README:
* gst/speexresample/arch.h:
* gst/speexresample/fixed_arm4.h:
* gst/speexresample/fixed_arm5e.h:
* gst/speexresample/fixed_bfin.h:
* gst/speexresample/fixed_debug.h:
* gst/speexresample/fixed_generic.h:
* gst/speexresample/resample.c: (compute_func), (main), (sinc),
(cubic_coef), (resampler_basic_direct_single),
(resampler_basic_direct_double),
(resampler_basic_interpolate_single),
(resampler_basic_interpolate_double), (update_filter),
(speex_resampler_init_frac), (speex_resampler_process_native),
(speex_resampler_magic), (speex_resampler_process_float),
(speex_resampler_process_int),
(speex_resampler_process_interleaved_float),
(speex_resampler_process_interleaved_int),
(speex_resampler_set_rate_frac), (speex_resampler_skip_zeros),
(speex_resampler_reset_mem):
* gst/speexresample/speex_resampler.h:
Update Speex resampler with latest version from Speex GIT.