#4 scponly cannot build on platforms which lack GNU getopt

[Stuart Shelton]

'configure' sets HAVE_GETOPT and HAVE_GETOPT_H, but the code doesn't honour these defines.

IRIX, for example, has /usr/include/getopt.h but this isn't GNU-compatible. This means that scponly fails to build due to the references to 'struct option' from line 88 of scponly.c.

This is a regression from version 4.6, which used 'cmd_arg_t' and did build successfully on IRIX.

(Also, on this platform, 'bzero' is defined in strings.h rather than string.h, so this should really be checked for and included.)

[Stuart Shelton]

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Notes:

scponly-4.6:

helper.c has '#elif' without a conditional on line 191: this should be '#else'.
Build requires '-lgen' on IRIX (for 'basename') - might this also effect Solaris & HP/UX?
Bulld ignores $LDFLAGS, so '-lgen' must be added to CFLAGS.

scponly-4.8:

scponly.c lacks a return statement for non-void 'function process_ssh_request' at line 875.
scponly.h defines extern functions 'strbeg' & 'strend' as inline.