nmap: build QA Warnings

WARNING: QA Issue: nmap rdepends on libcrypto, but it isn't a build dependency? [build-deps]
WARNING: QA Issue: nmap rdepends on libssl, but it isn't a build dependency? [build-deps]

This fixes the above QA warnings.

Signed-off-by: Armin Kuster <akuster808@gmail.com>
v2] nmap: use pkgconfig and reorg

Added pkgconfig support
Since most binaries provided by nmap can be excluded via configure
  manage via pkgconfig
Aligned python packages with binaries so nmap-python is no longer needed

V2: Missed some options in EXTRA_OECONF changes

Signed-off-by: Armin Kuster <akuster808@gmail.com>
nmap: Add gui support

Add zenmap to work with gtk+/x11

Signed-off-by: Armin Kuster <akuster808@gmail.com>
nmap: New QA issue via ppc

Fixes:
WARNING: QA Issue: nmap rdepends on libpcap, but it isn't a build dependency? [build-deps]

nmap internal lua library does not compile with PPC so use OE version instead.

Changed PACKAGECONFIG assignment from "??=" to "=". It was empty when using
PPC.

Signed-off-by: Armin Kuster <akuster808@gmail.com>
tripwire: ppc64 build failure.

| configure: error: /bin/sh ./config.sub powerpc64-poky-linux failed

config.sub did not understand the powerpc64 par.
this patch adds that understanding.

Signed-off-by: Armin Kuster <akuster808@gmail.com>
libnet-ssleay-perl: remove from layer

libnet-ssleay-perl is now in meta-perl

Signed-off-by: Armin Kuster <akuster808@gmail.com>
layer.conf: add layer depends.

added layerdepends check for  perl-layer and opemembedded-layer

Signed-off-by: Armin Kuster <akuster808@gmail.com>
README: update layers references

Signed-off-by: Armin Kuster <akuster808@gmail.com>