math.big: Incorrect division with negative numbers

[elliotchance]

Describe the bug

Division involving negative numbers may have incorrect rounding.

Reproduction Steps

module main

import math.big

fn main() {
	// Correct: 123
	println(big.integer_from_int(1234) / big.integer_from_int(10))

	// Incorrect: -124
	println(big.integer_from_int(-1234) / big.integer_from_int(10))

	// Correct: -123
	println(big.integer_from_int(1234) / big.integer_from_int(-10))

	// Incorrect: 124
	println(big.integer_from_int(-1234) / big.integer_from_int(-10))
}

Expected Behavior

123
-123
-123
123

Current Behavior

123
-124
-123
124

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.2 4bc9a8f.f54f156

Environment details (OS name and version, etc.)

V full version: V 0.4.2 4bc9a8f.f54f156
OS: macos, macOS, 12.6, 21G115
Processor: 10 cpus, 64bit, little endian, Apple M1 Max

getwd: /Users/elliot/Library/Mobile Documents/comappleCloudDocs/Development/github.com/elliotchance/vsql
vexe: /Users/elliot/Downloads/v-5/v
vexe mtime: 2023-10-15 18:52:03

vroot: OK, value: /Users/elliot/Downloads/v-5
VMODULES: OK, value: /Users/elliot/.vmodules
VTMP: OK, value: /tmp/v_501

Git version: git version 2.37.0 (Apple Git-136)
Git vroot status: weekly.2023.41-18-gf54f156d (7 commit(s) behind V master)
.git/config present: true

CC version: Apple clang version 14.0.0 (clang-1400.0.29.102)
thirdparty/tcc status: thirdparty-macos-amd64 46662e2

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