klibc: upgrade to latest git (pre 2.0)

* remove cherry-picked patch applied in master
* remove comments in klcc recipe
* remove slashes from paths in klibc recipe
* revert involontary oe_runmake install changes
* reset INC_PR
* v2 removes obolete cleanings wrt headers_install

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>