contrib: theora: disable doc generation

There will be a configuration option (--disable-doc) in 1.2.x but it's
not available for the current release.

Signed-off-by: Thomas Guillem <thomas@gllm.fr>

contrib/src/theora/rules.mak

@@ -17,6 +17,9 @@ libtheora: libtheora-$(THEORA_VERSION).tar.xz .sum-theora
 	$(UNPACK)
 	$(APPLY) $(SRC)/theora/libtheora-compiler-differentiation.patch
 	$(APPLY) $(SRC)/theora/libtheora-no-forceaddr.patch
+	# Disable the generation of documentation. In 1.2.x it can be replaced by
+	# a --disable-doc parameter.
+	sed -i.orig "/^SUBDIRS =/s/doc//g" "$(UNPACK_DIR)/Makefile.am" "$(UNPACK_DIR)/Makefile.in"
 	$(UPDATE_AUTOCONFIG)
 	$(MOVE)