Fix blazesym build issue on aarch64 and improve error handling

Co-authored-by: yunwei37 <34985212+yunwei37@users.noreply.github.com>

BLAZESYM_BUILD_WORKAROUND.md

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+# Blazesym Build Workaround for ARM64 Platforms
+
+This document provides workarounds for the blazesym build issue reported in [issue #148](https://github.com/eunomia-bpf/bpf-developer-tutorial/issues/148).
+
+## Issue Description
+
+When building blazesym with the `cheader` feature on ARM64 (aarch64) platforms, you may encounter the following error:
+
+```
+/usr/bin/ld: discarded output section: `.got.plt'
+collect2: error: ld returned 1 exit status
+```
+
+This error occurs because the linker script used for generating test files is too aggressive in discarding sections, including the `.got.plt` section which is essential on ARM64 platforms.
+
+## Workarounds
+
+### Option 1: Skip Test File Generation (Recommended)
+
+The easiest workaround is to build blazesym with the `dont-generate-test-files` feature flag:
+
+```bash
+cd src/third_party/blazesym
+cargo build --features=cheader,dont-generate-test-files
+```
+
+This flag skips the generation of test files that cause the linker issue.
+
+### Option 2: Install LLVM Tools
+
+If you want to build with test files, ensure you have `llvm-gsymutil` installed:
+
+```bash
+# On Ubuntu/Debian:
+sudo apt install llvm
+
+# On other systems, install LLVM development tools
+```
+
+### Option 3: Use Fixed Linker Script
+
+The linker script has been improved to be less aggressive about discarding sections. The fixed script avoids discarding essential sections like `.got.plt` that are needed on ARM64.
+
+## For Developers
+
+If you're working on examples that don't require blazesym's C header generation, you can simply build without the `cheader` feature:
+
+```bash
+cd src/third_party/blazesym
+cargo build
+```
+
+## Additional Notes
+
+- This issue is specific to ARM64 platforms and certain linker versions
+- The workaround does not affect the core functionality of blazesym
+- Test file generation is only needed for blazesym's internal testing, not for normal usage
+
+## References
+
+- [Issue #148](https://github.com/eunomia-bpf/bpf-developer-tutorial/issues/148)
+- [Blazesym Repository](https://github.com/libbpf/blazesym)