kbuild: use two double-quotes for localversion

Modifies LOCALVERSION definition such that it uses
patsubst instead of subst to remove surrounding double quotes from
CONFIG_LOCALVERSION.  This helps syntax-highlighting editors.

From: Tejun Heo <tj@home-tj.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Makefile

@@ -157,7 +157,7 @@ endif
 
 LOCALVERSION = $(subst $(space),, \
 	       $(shell cat /dev/null $(localversion-files)) \
-	       $(subst ",,$(CONFIG_LOCALVERSION)))
+	       $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 
 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)