crosstool-ng: Fix a number of bugs
crosstool-ng: Fix a number of bugs

* Pull in sysoot-dev package for rstage also
* Fix path to ldscripts/
* Strip away unneeded extra / in paths

diorcety/oe-lite-core,sknsean/core,sknsean/core,diorcety/oe-lite-core,hundeboll/core,hundeboll/core,hundeboll/core,sknsean/core,sknsean/core,sknsean/core,hundeboll/core