Kill off job::start() (it was only ever added as part of an aborted

attempt at triggering TCP-related protocols to start).

src/core/downloader.c

 
 /** Downloader job control interface operations */
 static struct job_interface_operations downloader_job_operations = {
-	.start		= ignore_job_start,
 	.done		= ignore_job_done,
 	.kill		= downloader_job_kill,
 	.progress	= ignore_job_progress,

src/core/job.c

  *
  */
 
-void ignore_job_start ( struct job_interface *job __unused ) {
-	/* Nothing to do */
-}
-
 void ignore_job_done ( struct job_interface *job __unused, int rc __unused ) {
 	/* Nothing to do */
 }
 
 /** Null job control interface operations */
 struct job_interface_operations null_job_ops = {
-	.start		= ignore_job_start,
 	.done		= ignore_job_done,
 	.kill		= ignore_job_kill,
 	.progress	= ignore_job_progress,

src/include/gpxe/job.h

 
 /** Job control interface operations */
 struct job_interface_operations {
-	/** Start job
-	 *
-	 * @v job		Job control interface
-	 */
-	void ( * start ) ( struct job_interface *job );
 	/** Job completed
 	 *
 	 * @v job		Job control interface
 
 extern void job_done ( struct job_interface *job, int rc );
 
-extern void ignore_job_start ( struct job_interface *job );
 extern void ignore_job_done ( struct job_interface *job, int rc );
 extern void ignore_job_kill ( struct job_interface *job );
 extern void ignore_job_progress ( struct job_interface *job,

src/net/udp/dhcp.c

 
 /** DHCP job control interface operations */
 static struct job_interface_operations dhcp_job_operations = {
-	.start		= ignore_job_start,
 	.done		= ignore_job_done,
 	.kill		= dhcp_job_kill,
 	.progress	= ignore_job_progress,