Bump bpf-tools version to 1.8

sdk/bpf/env.sh

@@ -14,16 +14,3 @@ export CC="$bpf_sdk/dependencies/bpf-tools/llvm/bin/clang"
 export AR="$bpf_sdk/dependencies/bpf-tools/llvm/bin/llvm-ar"
 export OBJDUMP="$bpf_sdk/dependencies/bpf-tools/llvm/bin/llvm-objdump"
 export OBJCOPY="$bpf_sdk/dependencies/bpf-tools/llvm/bin/llvm-objcopy"
-
-# Use the SDK's version of Rust to build for BPF
-export RUSTUP_TOOLCHAIN=bpf
-export RUSTFLAGS="
-    -C lto=no \
-    -C opt-level=2 \
-    -C link-arg=-z -C link-arg=notext \
-    -C link-arg=-T$bpf_sdk/rust/bpf.ld \
-    -C link-arg=--Bdynamic \
-    -C link-arg=-shared \
-    -C link-arg=--threads=1 \
-    -C link-arg=--entry=entrypoint \
-    -C linker=$bpf_sdk/dependencies/bpf-tools/llvm/bin/ld.lld"