python,python3: move shebang handle in install script

This extends the Python[3] shebang fixup to all packages.
Only Python scripts in `/usr/bin` will be handled at the moment. Later it
may make sense to also cover executables in `/bin`, though typically Python
executables shouldn't be placed there.

Previously the shebang handling was only done for python[3]-pip &
python[3]-setuptools.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/python-package-install.sh

@@ -52,6 +52,12 @@ process_filespec "$src_dir" "$dst_dir" "$filespec" || {
 	exit 1
 }
 
+usr_bin_dir="$dst_dir/usr/bin"
+
+if [ -d "$usr_bin_dir" ] ; then
+	sed "1"'!'"b;s,^#"'!'".*python.*,#"'!'"/usr/bin/python${ver}," -i $usr_bin_dir/*
+fi
+
 if [ "$mode" == "sources" ] ; then
 	# Copy only python source files
 	find $dst_dir -not -type d -not -name "*\.py" | xargs rm -f