kbuild: create .kernelrelease at *config step

To enable 'make kernelrelease' earlier now create .kernelrelease when
one of the *config targets are used.
Also introduce KERNELVERSION - only user is kconfig.
KERNELVERSION was needed to display kernel version in menuconfig -
KERNELRELEASE is not valid until configuration has completed.
kconfig files modified to use KERNELVERSION.
Bug reported by: Rene Rebe <rene@exactcode.de>

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/kconfig/confdata.c

@@ -375,7 +375,7 @@ int conf_write(const char *name)
 		if (!out_h)
 			return 1;
 	}
-	sym = sym_lookup("KERNELRELEASE", 0);
+	sym = sym_lookup("KERNELVERSION", 0);
 	sym_calc_value(sym);
 	time(&now);
 	env = getenv("KCONFIG_NOTIMESTAMP");

scripts/kconfig/gconf.c

@@ -276,7 +276,7 @@ void init_main_window(const gchar * glade_file)
 					  NULL);
 
 	sprintf(title, _("Linux Kernel v%s Configuration"),
-		getenv("KERNELRELEASE"));
+		getenv("KERNELVERSION"));
 	gtk_window_set_title(GTK_WINDOW(main_wnd), title);
 
 	gtk_widget_show(main_wnd);

scripts/kconfig/mconf.c

@@ -1051,7 +1051,7 @@ int main(int ac, char **av)
 	conf_parse(av[1]);
 	conf_read(NULL);
 
-	sym = sym_lookup("KERNELRELEASE", 0);
+	sym = sym_lookup("KERNELVERSION", 0);
 	sym_calc_value(sym);
 	sprintf(menu_backtitle, _("Linux Kernel v%s Configuration"),
 		sym_get_string_value(sym));

scripts/kconfig/symbol.c

@@ -61,10 +61,10 @@ void sym_init(void)
 	if (p)
 		sym_add_default(sym, p);
 
-	sym = sym_lookup("KERNELRELEASE", 0);
+	sym = sym_lookup("KERNELVERSION", 0);
 	sym->type = S_STRING;
 	sym->flags |= SYMBOL_AUTO;
-	p = getenv("KERNELRELEASE");
+	p = getenv("KERNELVERSION");
 	if (p)
 		sym_add_default(sym, p);