fix: remove unused CallConv import in jit/compiler.rs

Author: blackopsrepl

crates/solverforge-dynamic/src/jit/compiler.rs

@@ -25,7 +25,6 @@
 use cranelift_codegen::ir::condcodes::IntCC;
 use cranelift_codegen::ir::types::I64;
 use cranelift_codegen::ir::{AbiParam, Function, InstBuilder, MemFlags, Signature, UserFuncName};
-use cranelift_codegen::isa::CallConv;
 use cranelift_codegen::settings::{self, Configurable};
 use cranelift_codegen::Context;
 use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext};