agent: Keep CAP_DAC_OVERRIDE to connect to ssh-agent socket

This is also required if charon-cmd is used with capability dropping.

src/charon-nm/nm/nm_backend.c

@@ -22,10 +22,6 @@
 #include <daemon.h>
 #include <processing/jobs/callback_job.h>
 
-#ifndef CAP_DAC_OVERRIDE
-#define CAP_DAC_OVERRIDE 1
-#endif
-
 typedef struct nm_backend_t nm_backend_t;
 
 /**
@@ -143,14 +139,6 @@ static bool nm_backend_init()
 		return FALSE;
 	}
 
-	/* bypass file permissions to read from users ssh-agent */
-	if (!lib->caps->keep(lib->caps, CAP_DAC_OVERRIDE))
-	{
-		DBG1(DBG_CFG, "NM backend requires CAP_DAC_OVERRIDE capability");
-		nm_backend_deinit();
-		return FALSE;
-	}
-
 	lib->processor->queue_job(lib->processor,
 		(job_t*)callback_job_create_with_prio((callback_job_cb_t)run, this,
 				NULL, (callback_job_cancel_t)cancel, JOB_PRIO_CRITICAL));