contrib: add speexdsp rules and patches

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

Change-Id: I0d74485018f50767c00a800f0361bff85c66bfe6

contrib/src/speexdsp/rules.mak

+# speexdsp
+
+SPEEXDSP_VERSION := git
+SPEEXDSP_HASH := HEAD
+SPEEXDSP_GITURL := http://git.xiph.org/?p=speexdsp.git;a=snapshot;h=$(SPEEXDSP_HASH);sf=tgz
+
+PKGS += speexdsp
+ifeq ($(call need_pkg,"speexdsp"),)
+PKGS_FOUND += speexdsp
+endif
+
+$(TARBALLS)/speexdsp-git.tar.gz:
+	$(call download,$(SPEEXDSP_GITURL))
+
+.sum-speexdsp: speexdsp-$(SPEEXDSP_VERSION).tar.gz
+	$(warning $@ not implemented)
+	touch $@
+
+speexdsp: speexdsp-$(SPEEXDSP_VERSION).tar.gz .sum-speexdsp
+	rm -Rf $@-git $@
+	mkdir -p $@-git
+	$(ZCAT) "$<" | (cd $@-git && tar xv --strip-components=1)
+	$(MOVE)
+
+SPEEXDSP_CONF := --enable-resample-full-sinc-table
+ifndef HAVE_FPU
+SPEEXDSP_CONF += --enable-fixed-point
+ifeq ($(ARCH),arm)
+SPEEXDSP_CONF += --enable-arm5e-asm
+endif
+endif
+
+.speexdsp: speexdsp
+	mkdir -p $</m4 && $(RECONF)
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF) $(SPEEXDSP_CONF)
+	cd $< && $(MAKE) install
+	touch $@