Support Electron apps

[DogeProtocol]

randombytes/randombytes.c

Line 302 in 1c0c666

crypto = require('crypto');

The code under randombytes_js_randombytes_nodejs doesn't seem to work for Electron apps webassembly. Since many implementations don't check for return value of randombytes, downstream code was silently passing and causing security issues.

We have an updated version for randombytes_js_randombytes_nodejs that worked for electronjs app as well (as per Mozilla docs, window.crypto is a CSPRNG)
https://developer.mozilla.org/en-US/docs/Web/API/Crypto

Example:
https://github.com/DogeProtocol/hybrid-pqc/blob/d13f9d3944515ccdd7eee4fe98b08562b71564ef/random/randombytes.c#L322C1-L327C4

`#if defined(EMSCRIPTEN)
static int randombytes_js_randombytes_nodejs(void *buf, size_t n) {

const int ret = EM_ASM_INT({

	if (window.crypto && window.crypto.getRandomValues) { 
		var randBuffer = new Uint8Array($1);
		window.crypto.getRandomValues(randBuffer);
		writeArrayToMemory(randBuffer, $0);
		return 0;
	}


	var cryptoMod;
	try {
		cryptoMod = require('crypto');
	} catch (error) {
		return -2;
	}
	try {
		writeArrayToMemory(cryptoMod.randomBytes($1), $0);
		return 0;
	} catch (error) {
		return -1;
	}
}, buf, n);
switch (ret) {
case 0:
	return 0;
case -1:
	errno = EINVAL;
	return -1;
case -2:
	errno = ENOSYS;
	return -1;
}
return -3;
assert(false); // Unreachable

}
#endif /* defined(EMSCRIPTEN) */`