doc: Remove unused -fPIC

This is harmless, but no longer needed after commit
06b9236.

Author: MarcoFalke

contrib/devtools/README.md

@@ -11,12 +11,15 @@ A tool to check for non-determinism in fuzz coverage. To get the help, run:
 RUST_BACKTRACE=1 cargo run --manifest-path ./contrib/devtools/deterministic-fuzz-coverage/Cargo.toml -- --help
 ```
 
-To execute the tool, compilation has to be done with the build options
-`-DCMAKE_C_COMPILER='clang' -DCMAKE_CXX_COMPILER='clang++'
--DBUILD_FOR_FUZZING=ON -DCMAKE_CXX_FLAGS='-fPIC -fprofile-instr-generate
--fcoverage-mapping'`. Both llvm-profdata and llvm-cov must be installed. Also,
-the qa-assets repository must have been cloned. Finally, a fuzz target has to
-be picked before running the tool:
+To execute the tool, compilation has to be done with the build options:
+
+```
+-DCMAKE_C_COMPILER='clang' -DCMAKE_CXX_COMPILER='clang++' -DBUILD_FOR_FUZZING=ON -DCMAKE_CXX_FLAGS='-fprofile-instr-generate -fcoverage-mapping'
+```
+
+Both llvm-profdata and llvm-cov must be installed. Also, the qa-assets
+repository must have been cloned. Finally, a fuzz target has to be picked
+before running the tool:
 
 ```
 RUST_BACKTRACE=1 cargo run --manifest-path ./contrib/devtools/deterministic-fuzz-coverage/Cargo.toml -- $PWD/build_dir $PWD/qa-assets/corpora-dir fuzz_target_name