Missing polly added to prerequisites

[ali77gh]

When I ran cargo build --release I got this error:

❯ cargo build --release           
   Compiling llvm-sys v181.2.0
   Compiling inkwell v0.6.0
error: could not find native static library `Polly`, perhaps an -L flag is missing?

error: could not compile `llvm-sys` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...

Then I installed polly with apt:

sudo apt install libpolly-18-dev

[Soroushsrd]

LGTM
Thank you for the fix

[ali77gh]

You're welcome.