nmap: make ndiff support python3

The ndiff is python2 compatible now, backport
a patch from debian to make ndiff port to python3.

Refer to https://sources.debian.org/data/main/n/nmap/7.80+dfsg1-2/debian/patches/0004-Python3-port-of-ndiff.patch

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-security/nmap/nmap_7.80.bb

@@ -10,6 +10,8 @@ SRC_URI = "http://nmap.org/dist/${BP}.tar.bz2 \
            file://nmap-replace-shtool-mkdir-with-coreutils-mkdir-command.patch \
            file://0001-Include-time.h-header-to-pass-clang-compilation.patch \
            file://0002-Fix-building-with-libc.patch \
+           file://0001-Make-ndiff-support-python3.patch \
+           file://0001-configure.ac-make-ndiff-depend-on-python3.patch \
            "
 
 SRC_URI[md5sum] = "d37b75b06d1d40f27b76d60db420a1f5"
@@ -28,7 +30,7 @@ PACKAGECONFIG[libz] = "--with-libz=${STAGING_LIBDIR}/.., --without-libz, zlib, z
 #disable/enable packages
 PACKAGECONFIG[nping] = ",--without-nping,"
 PACKAGECONFIG[ncat] = ",--without-ncat,"
-PACKAGECONFIG[ndiff] = ",--without-ndiff,python3"
+PACKAGECONFIG[ndiff] = "--with-ndiff=yes,--without-ndiff,python3"
 PACKAGECONFIG[update] = ",--without-nmap-update,"
 
 EXTRA_OECONF = "--with-libdnet=included --with-liblinear=included --without-subversion --with-liblua=included"
@@ -47,6 +49,12 @@ do_configure() {
     oe_runconf
 }
 
+do_install_append() {
+    if [ -f "${D}${bindir}/ndiff" ]; then
+       sed -i 's@^#!.*$@#!/usr/bin/env python3@g'   ${D}${bindir}/ndiff
+    fi
+}
+
 FILES_${PN} += "${PYTHON_SITEPACKAGES_DIR} ${datadir}/ncat"
 
-RDEPENDS_${PN} = "python3"
+RDEPENDS_${PN} += "python3-core"