um: Remove unused os_getpgrp function

The function is not used anywhere.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20240913134442.967599-5-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

arch/um/include/shared/os.h

@@ -204,7 +204,6 @@ extern void os_kill_process(int pid, int reap_child);
 extern void os_kill_ptraced_process(int pid, int reap_child);
 
 extern int os_getpid(void);
-extern int os_getpgrp(void);
 
 extern void init_new_thread_signals(void);
 

arch/um/os-Linux/process.c

@@ -53,11 +53,6 @@ int os_getpid(void)
 	return syscall(__NR_getpid);
 }
 
-int os_getpgrp(void)
-{
-	return getpgrp();
-}
-
 int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
 		  int r, int w, int x)
 {