Support deploy time linking

[smiasojed]

Add support for deploy time linking to compile this code correctly:

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

library Assert {
    function equal(uint256 a, uint256 b) public pure returns (bool result) {
    result = (a == b);
  }
}

contract TestAssert {
    function checkEquality(uint256 a, uint256 b) public pure returns (string memory) {
        Assert.equal(a, b);
        return "Values are equal";
    }
}