readme: document only the necessary apt packages

Only the make, clang, libelf-dev, libc6-dev-i386, and libbpf-dev packages
are needed. Document them.

Signed-off-by: Chester A. Unal <[email protected]>

Author: arinc9

README.md

@@ -102,10 +102,11 @@ Checksum:
 
 ## Build
 
-Build the binary using `make`. CLang and `libbpf` is required, e.g.
+Build the binary using `make`. CLang, `libelf`, `libc6`, and `libbpf` are
+required:
 
 ```
-sudo apt install clang llvm libelf-dev build-essential libc6-dev-i386 libbpf-dev
+sudo apt install make clang libelf-dev libc6-dev-i386 libbpf-dev
 ```