add win32 (msvc) support

core/sys/windows/random.c

@@ -0,0 +1,30 @@
+#include <fcntl.h>
+#include <stdint.h>
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#include <wincrypt.h>
+
+uint64_t z__b_platform_random_seed_secure(void)
+{
+	BOOL status;
+	HCRYPTPROV hCryptProv;
+	status = CryptAcquireContext(
+		&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
+
+	if (status == FALSE) {
+		return (uint64_t)-1;
+	}
+
+	uint64_t v = 0;
+	status = CryptGenRandom(hCryptProv, sizeof v, (BYTE *)&v);
+
+	CryptReleaseContext(hCryptProv, 0);
+
+	return status == TRUE ? v : (uint64_t)-1;
+}
+
+uint64_t z__b_platform_random_seed(void)
+{
+	return z__b_platform_random_seed_secure();
+}