Add recipe for nettle package, build the package from Debian source
user
```bitbake
#
# base recipe: http://cgit.openembedded.org/openembedded-core/tree/meta/recipes-support/nettle/nettle_2.7.1.bb
# base branch: master
#

PR = "r0"

inherit debian-package

LICENSE = "LGPLv2.1 & GPLv2"
LIC_FILES_CHKSUM = "file://COPYING.LIB;md5=2d5025d4aa3495befef8f17206a5b0a1"

DEPENDS += "gmp"

SRC_URI[md5sum] = "003d5147911317931dd453520eb234a5"
SRC_URI[sha256sum] = "bc71ebd43435537d767799e414fce88e521b7278d48c860651216e1fc6555b40"

EXTRA_OECONF = "--disable-openssl"

do_configure_prepend() {
       if [ ! -e ${S}/acinclude.m4 -a -e ${S}/aclocal.m4 ]; then
               cp ${S}/aclocal.m4 ${S}/acinclude.m4
       fi
}

inherit autotools

BBCLASSEXTEND = "native nativesdk"
```
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