mesa: update 20.1.5 -> 20.1.6

(From OE-Core rev: 28a0c267bde3710f0debe1a9a857c6387d090e23)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/mesa/mesa.inc

@@ -23,7 +23,7 @@ SRC_URI = "https://mesa.freedesktop.org/archive/mesa-${PV}.tar.xz \
            file://0001-meson-misdetects-64bit-atomics-on-mips-clang.patch \
            "
 
-SRC_URI[sha256sum] = "fac1861e6e0bf1aec893f8d86dbfb9d8a0f426ff06b05256df10e3ad7e02c69b"
+SRC_URI[sha256sum] = "23bed40114b03ad640c95bfe72cc879ed2f941d0d481b77b5204a1fc567fa93c"
 
 UPSTREAM_CHECK_GITTAGREGEX = "mesa-(?P<pver>\d+(\.\d+)+)"