internal bind libraries are used even if --with-libbind=/some/external/path is specified

[Eugene Rudoy]

Dear all,

DHCP's configure offers an option "--with-libbind=PATH bind includes
and libraries are in PATH", which makes one think external bind
libraries could be used. Unfortunately the option only adds
"-I$libbind/include" to CFLAGS and doesn't do anything else - bind
libraries from ./bind subdir are used regardless of the with-libbind
value.

The attached patches fix the problem for me both for 4.2.x and for 4.3.x.

Would appreciate it if the patches would make it upstream. Thanks!

Best regards,
Gene
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