Add Speex playback support. Patch from FS #5607 thanks to Frederik Vestre.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12241 a1c6a512-1295-4272-9138-f99709370657

apps/codecs/libspeex/SOURCES

@@ -0,0 +1,38 @@
+nb_celp.c
+sb_celp.c
+lpc.c
+ltp.c
+lsp.c
+quant_lsp.c
+lsp_tables_nb.c
+gain_table.c
+gain_table_lbr.c
+cb_search.c
+filters.c
+bits.c
+modes.c
+speex.c
+vq.c
+high_lsp_tables.c
+vbr.c
+hexc_table.c
+exc_5_256_table.c
+exc_5_64_table.c
+exc_8_128_table.c
+exc_10_32_table.c
+exc_10_16_table.c
+exc_20_32_table.c
+hexc_10_32_table.c
+misc.c
+speex_header.c
+speex_callbacks.c
+math_approx.c
+stereo.c
+preprocess.c
+jitter.c
+mdf.c
+fftwrap.c
+kiss_fft.c
+kiss_fftr.c
+window.c
+oggframing.c