bug#52671: glibc patch causes crash on failure to find path to executable

[Ivan Kozlov]

glibc-dl-cache.patch causes segmentation fault when _dl_get_origin fails (which 
should be harmless unless there is $ORIGIN in RUNPATH). I found this when 
running a dynamically linked executable as ‘init’, before /proc was mounted. 
There needs to be an origin != (char *)-1 check.