contrib: remove speexdsp includedir patch

No longer needed due to upstream change.

(cherry picked from commit 8a9ac878b21ede8a65efdf71c6f5cc5b8fa3a88b)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/speexdsp/includedir.patch

---- speexdsp/include/speex/Makefile.am.orig	2013-12-08 11:50:39.859569265 +0100
-+++ speexdsp/include/speex/Makefile.am	2013-12-08 11:50:48.535568900 +0100
-@@ -2,6 +2,7 @@
- #AUTOMAKE_OPTIONS = no-dependencies
- 
- nodist_pkginclude_HEADERS = speexdsp_config_types.h
-+pkgincludedir=$(includedir)/speex
- 
- pkginclude_HEADERS = speex_echo.h speex_jitter.h speex_preprocess.h speex_resampler.h \
- 	speexdsp_types.h

contrib/src/speexdsp/rules.mak

@@ -21,7 +21,6 @@ speexdsp: speexdsp-$(SPEEXDSP_VERSION).tar.gz .sum-speexdsp
 	mkdir -p $@-git
 	$(ZCAT) "$<" | (cd $@-git && tar xv --strip-components=1)
 	$(APPLY) $(SRC)/speexdsp/neon.patch
-	$(APPLY) $(SRC)/speexdsp/includedir.patch
 	$(MOVE)
 
 SPEEXDSP_CONF := --enable-resample-full-sinc-table