SSL and USER_CERT_FILE

I am using PostgreSQL's SSL sup****t and the conventions for the key and
certifications don't make sense from the client perspective. Especially
under Windows.

I am proposing a few simple changes:

Adding two API
void PQsetSSLUserCertFileName(char *filename)
{
    user_crt_filename = strdup(filename);
}
PQsetSSLUserKeyFileName(char *filename)
{
    user_key_filename = strdup(filename);
}

Adding two static vars in fe-secure.c

char *user_key_filename=NULL;
char *user_crt_filename=NULL;

In client_cert_cb(...)

Add:
if(user_crt_filename)
    strncpy(fnbuf, sizeof(fnbuf), user_crt_filename);
else
    snprintf(fnbuf, sizeof(fnbuf), "%s/%s", homedir, USER_CERT_FILE);

and:

if(user_key_filename)
    strncpy(fnbuf, sizeof(fnbuf), user_key_filename);
else
    snprintf(fnbuf, sizeof(fnbuf), "%s/%s", homedir, USER_KEY_FILE);


The purpose of these changes is to make it easier to configure SSL in an
application which uses libpq.

Any comments?

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