llvm-project-source: Fix syntax overrides

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

recipes-devtools/clang/llvm-project-source.bbappend

@@ -2,7 +2,7 @@
 # LLVM 10/11 version of SPIRV-LLVM-Translator)
 
 SPIRV_BRANCH = "llvm_release_130"
-SRC_URI_append_intel-x86-common = " \
+SRC_URI:append:intel-x86-common = " \
                                     git://github.com/KhronosGroup/SPIRV-LLVM-Translator.git;protocol=https;branch=${SPIRV_BRANCH};destsuffix=git/llvm/projects/llvm-spirv;name=spirv \
                                     "
 SRCREV_spirv = "d819fa34e01f7a1807c4be7bac321b3abad3f140"