e_capi.c: rearrange #include-s to improve portability.

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <malloc.h>

#ifndef alloca

# define alloca _alloca

#endif

#include <openssl/crypto.h>

#include <openssl/buffer.h>

#include <openssl/bn.h>

#ifdef OPENSSL_SYS_WIN32

#ifndef OPENSSL_NO_CAPIENG

#include <openssl/buffer.h>

#include <openssl/bn.h>

#include <openssl/rsa.h>

#include <windows.h>

#ifndef _WIN32_WINNT

#define _WIN32_WINNT 0x0400

#endif

#include <windows.h>

#include <wincrypt.h>

#include <malloc.h>

#ifndef alloca

# define alloca _alloca

#endif

/*

 * This module uses several "new" interfaces, among which is