recipes: be carefull with # comments ending with backslash

* next line after #foo \ is not parsed correctly!
* but http://bugzilla.pokylinux.org/show_bug.cgi?id=813

 says NOTABUG, so be *very carefull*

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>