contrib: add speex rules and patches

Based on VideoLan code by Rémi Denis-Courmont et al.
Refs: #46617

Change-Id: I4c0375dd33fa2878a986ff501f4679a40fa96138

contrib/src/speex/0001-Add-disable-binaries-option-to-build-only-the-librar.patch

+From 20bc88f0cda8325cf5d22ee470f7f93c87891a91 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C3=ABl=20Carr=C3=A9?= <funman@videolan.org>
+Date: Sun, 8 Dec 2013 08:44:07 +0100
+Subject: [PATCH] Add --disable-binaries option to build only the library
+
+---
+ configure.ac | 10 ++++++++--
+ 1 file changed, 8 insertions(+), 2 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 07ebff2..01dbfba 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -109,7 +109,13 @@ AC_MSG_RESULT($has_visibility)
+ 
+ AC_CHECK_HEADERS(sys/soundcard.h sys/audioio.h)
+ 
+-XIPH_PATH_OGG([src="src"], [src=""])
++AC_ARG_ENABLE(binaries, [  --disable-binaries      Do not build the encoder and decoder binaries, only the library])
++if test "$enable_binaries" != no; then
++    XIPH_PATH_OGG([src="src"], [src=""])
++else
++    src=""
++fi
++
+ AC_SUBST(src)
+ 
+ LT_LIB_M
+@@ -339,7 +345,7 @@ AC_CONFIG_HEADERS([config.h])
+ AC_OUTPUT
+ 
+ 
+-if test "x$src" = "x"; then 
++if test "x$src" = "x" -a "$enable_binaries" != no; then
+ echo "**IMPORTANT**"
+ echo "You don't seem to have the development package for libogg (libogg-devel) installed. Only the Speex library (libspeex) will be built (no encoder/decoder executable)"
+ echo "You can download libogg from http://downloads.xiph.org/releases/ogg/"
+-- 
+1.8.3.2
+

contrib/src/speex/rules.mak

+# speex
+
+SPEEX_VERSION := git
+SPEEX_HASH := HEAD
+SPEEX_GITURL := http://git.xiph.org/?p=speex.git;a=snapshot;h=$(SPEEX_HASH);sf=tgz
+
+PKGS += speex
+ifeq ($(call need_pkg,"speex >= 1.0.5"),)
+PKGS_FOUND += speex
+endif
+
+$(TARBALLS)/speex-git.tar.gz:
+	$(call download,$(SPEEX_GITURL))
+
+.sum-speex: speex-$(SPEEX_VERSION).tar.gz
+	$(warning $@ not implemented)
+	touch $@
+
+speex: speex-$(SPEEX_VERSION).tar.gz .sum-speex
+	rm -Rf $@-git $@
+	mkdir -p $@-git
+	$(ZCAT) "$<" | (cd $@-git && tar xv --strip-components=1)
+	$(APPLY) $(SRC)/speex/0001-Add-disable-binaries-option-to-build-only-the-librar.patch
+	$(MOVE)
+
+SPEEX_CONF := --disable-binaries
+ifndef HAVE_FPU
+SPEEX_CONF += --enable-fixed-point
+ifeq ($(ARCH),arm)
+SPEEX_CONF += --enable-arm5e-asm
+endif
+endif
+
+.speex: speex
+	mkdir -p $</m4 && $(RECONF)
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF) $(SPEEX_CONF)
+	cd $< && $(MAKE) install
+	touch $@