curl: control ipv6 support based on DISTRO feature
By default ipv6 is auto detected for native builds but disabled when
cross compiling.
This commit adds a PACKAGECONFIG option, unconditionally enabled for
native and nativesdk builds and controlled by the ipv6 DISTRO feature
for target builds.
Signed-off-by: Andre McCurdy <armccurdy@gmail.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
