build-llvm: Bump to LLVM 17.0.1 final

There was a minor issue with the version information in what
was tagged as 17.0.0, so 17.0.1 is the first proper stable
release on the 17.x release branch.

build-llvm.sh

@@ -16,7 +16,7 @@
 
 set -e
 
-: ${LLVM_VERSION:=llvmorg-17.0.0-rc4}
+: ${LLVM_VERSION:=llvmorg-17.0.1}
 ASSERTS=OFF
 unset HOST
 BUILDDIR="build"