fad-getad.c : Linux-specific path hardcoded.

[guyharris]

Converted from SourceForge issue 1759580, submitted by rcb-isis

Cross-compilation for LynxOS / GCC.

Line 64 :
The header "if_packet.h" is targeted for a Linux-specific path, that cause a compilation failure on LynxOS.

Added a test for this platform, in order to allow a correct header inclusion.

Should be corrected for others non-Linux platforms, I think.

[guyharris]

Submitted by guy_harris

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Checked into the main and x.9 branches.

Will be corrected for any non-Linux platform that has AF_PACKET and that anybody reports to us. I don't know of any others.