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>