Add a welcome message including the revision number when initializing the

syslog so syslogs always contain the revision number too (as does serial
output).
This is only necessary because the early part of the serial output (that
contains the revision number) does not make it into the syslog. So fixing that
might be the better way.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25804 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/debug/debug.cpp

@@ -17,6 +17,7 @@
 #include <int.h>
 #include <kernel.h>
 #include <smp.h>
+#include <system_info.h>
 #include <thread.h>
 #include <tracing.h>
 #include <vm.h>
@@ -832,6 +833,7 @@ static status_t
 syslog_init(struct kernel_args *args)
 {
 	status_t status;
+	int32 length = 0;
 
 	if (!sSyslogOutputEnabled)
 		return B_OK;
@@ -858,6 +860,11 @@ syslog_init(struct kernel_args *args)
 	if (args->debug_output != NULL)
 		syslog_write((const char*)args->debug_output, args->debug_size);
 
+	char revisionBuffer[64];
+	length = snprintf(revisionBuffer, sizeof(revisionBuffer),
+		"Welcome to syslog debug output!\nHaiku revision: %lu\n",
+		get_haiku_revision());
+	syslog_write(revisionBuffer, length);
 	return B_OK;
 
 err3: