postinst_intercept: allow to pass variables with spaces

* trying to pass foo="a b" through postinst_intercept ends
  with the actual script header to containing:
  b
  foo=a
  which fails because "b" command doesn't exist.

(From OE-Core rev: c66d7d85b7225be8c838449324d506565dd0081d)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/postinst-intercepts/postinst_intercept

@@ -48,7 +48,7 @@ if [ -n "$pkgs_line" ]; then
 		sed -i -e "s/##PKGS:.*/\0${package_name} /" $intercept_script
 	fi
 else
-	for var in $@; do
+	for var in "$@"; do
 		sed -i -e "\%^#\!/bin/.*sh%a $var" $intercept_script
 	done
 	echo "##PKGS: ${package_name} " >> $intercept_script