speex: update SRC_URI

The US download mirror appears to be down, so use the main host instead.

(From OE-Core rev: 8766a93c2c9774e53bb7950f8407243ece4ac682)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/speex/speex_1.2.0.bb

@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=314649d8ba9dd7045dfb6683f298d0a8 \
                     file://include/speex/speex.h;beginline=1;endline=34;md5=ef8c8ea4f7198d71cf3509c6ed05ea50"
 DEPENDS = "libogg speexdsp"
 
-SRC_URI = "http://downloads.us.xiph.org/releases/speex/speex-${PV}.tar.gz"
+SRC_URI = "http://downloads.xiph.org/releases/speex/speex-${PV}.tar.gz"
 UPSTREAM_CHECK_REGEX = "speex-(?P<pver>\d+(\.\d+)+)\.tar"
 
 SRC_URI[md5sum] = "8ab7bb2589110dfaf0ed7fa7757dc49c"