Windows, GNUPGHOME, registry

[disastry@saiknes.lv]

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Hello

In Windows GPG reads GNUPGHOME from registry..
Keeping settings in registry sux (even if you have been told otherwise).
I think it would be better to try to read from registry and
if there is no GNUPGHOME then try to read from environment.

I suggest to change following in g10.c and gpgv.c:

  #ifdef __MINGW32__
    opt.homedir = read_w32_registry_string( NULL, "Software\\GNU\\GnuPG", "HomeDir" );
  #else
    opt.homedir = getenv("GNUPGHOME");
  #endif
    if( !opt.homedir || !*opt.homedir ) {
	opt.homedir = GNUPG_HOMEDIR;
    }

to:

    opt.homedir = 0;
  #ifdef __MINGW32__
    opt.homedir = read_w32_registry_string( NULL, "Software\\GNU\\GnuPG", "HomeDir" );
  #endif
    if( !opt.homedir || !*opt.homedir ) {
        opt.homedir = getenv("GNUPGHOME");
    }
    if( !opt.homedir || !*opt.homedir ) {
	opt.homedir = GNUPG_HOMEDIR;
    }


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