shaderc: upgrade 2021.2 -> 2021.3

- SHADERC_SKIP_COPYRIGHT_CHECK is a new cmake option to skip
the copyright check and as we don't needs it we can avoid the check.
f6d6dddfab

(From OE-Core rev: 8e8b24e7c557b436b5956081c5830f9fef6a02d4)

Signed-off-by: Jose Quaresma <quaresma.jose@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/shaderc/shaderc_2021.3.bb

@@ -6,7 +6,7 @@ HOMEPAGE = "https://github.com/google/shaderc"
 LICENSE = "Apache-2.0"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=86d3f3a95c324c9479bd8986968f4327"
 
-SRCREV = "2c5ef1b8f8b1fdcbe1b22764e82d5caaa1d04ef9"
+SRCREV = "6fabc36fbebacfcef8cf82463df2a8247120ebf0"
 SRC_URI = "git://github.com/google/shaderc.git;protocol=https;branch=main \
            file://0001-cmake-disable-building-external-dependencies.patch \
            file://0002-libshaderc_util-fix-glslang-header-file-location.patch \
@@ -23,6 +23,7 @@ EXTRA_OECMAKE = " \
     -DBUILD_EXTERNAL=OFF \
     -DSHADERC_SKIP_TESTS=ON \
     -DSHADERC_SKIP_EXAMPLES=ON \
+    -DSHADERC_SKIP_COPYRIGHT_CHECK=ON \
 "
 
 BBCLASSEXTEND = "native nativesdk"