Cleanly split Linux proc.h (fs) from conflicting Solaris proc.h (process)

Under linux the proc.h header is for the /proc filesystem, and under
Solaris the proc/h header if for processes.  This patch correctly
moves the Linux proc functionality in a linux/proc_compat.h header
and leaves the sys/proc.h for use by Solaris.  Minor updates were
required to all the call sites where it was included of course.

module/spl/spl-debug.c

@@ -34,8 +34,8 @@
 #include <linux/hardirq.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
+#include <linux/proc_compat.h>
 #include <sys/sysmacros.h>
-#include <sys/proc.h>
 #include <sys/debug.h>
 #include <spl-ctl.h>
 

module/spl/spl-generic.c

@@ -38,6 +38,7 @@
 #include <sys/utsname.h>
 #include <sys/file.h>
 #include <linux/kmod.h>
+#include <linux/proc_compat.h>
 
 #ifdef DEBUG_SUBSYSTEM
 #undef DEBUG_SUBSYSTEM
@@ -53,7 +54,7 @@ EXPORT_SYMBOL(spl_hostid);
 char hw_serial[HW_HOSTID_LEN] = "<none>";
 EXPORT_SYMBOL(hw_serial);
 
-int p0 = 0;
+proc_t p0 = { 0 };
 EXPORT_SYMBOL(p0);
 
 #ifndef HAVE_KALLSYMS_LOOKUP_NAME

module/spl/spl-kstat.c

@@ -25,6 +25,7 @@
 \*****************************************************************************/
 
 #include <sys/kstat.h>
+#include <linux/seq_file.h>
 
 static spinlock_t kstat_lock;
 static struct list_head kstat_list;

module/spl/spl-proc.c

@@ -24,7 +24,11 @@
  *  Solaris Porting Layer (SPL) Proc Implementation.
 \*****************************************************************************/
 
-#include <sys/proc.h>
+#include <sys/systeminfo.h>
+#include <sys/kstat.h>
+#include <linux/kmod.h>
+#include <linux/seq_file.h>
+#include <linux/proc_compat.h>
 
 #ifdef DEBUG_SUBSYSTEM
 #undef DEBUG_SUBSYSTEM

module/spl/spl-thread.c

@@ -83,7 +83,7 @@ EXPORT_SYMBOL(__thread_exit);
  * style callers likely never check for... since it can't fail. */
 kthread_t *
 __thread_create(caddr_t stk, size_t  stksize, thread_func_t func,
-		const char *name, void *args, size_t len, int *pp,
+		const char *name, void *args, size_t len, proc_t *pp,
 		int state, pri_t pri)
 {
 	thread_priv_t *tp;