Add OLLVM-obfuscated binary test_fla_argv

see source code at examples/src/linux/fla_test.c

How to build with OLLVM CFG flatten:
git clone git@github.com:heroims/obfuscator.git -b llvm-9.0
mkdir build-ollvm && cd build-ollvm
cmake -DCMAKE_BUILD_TYPE=Release -DLLVM_INCLUDE_TESTS=OFF -G Ninja ../obfuscator/
ninja
./bin/clang -m32 -mllvm -fla fla_test.c -o test_fla_argv

Author: chinggg