Set the svn revision (shows up in 'flashrom -R' output).

Index: a/Makefile
===================================================================
--- a/Makefile	2014-05-03 18:31:37.000000000 +0200
+++ b/Makefile	2014-05-03 18:32:35.000000000 +0200
@@ -348,7 +348,7 @@
 # Set the flashrom version string from the highest revision number of the checked out flashrom files.
 # Note to packagers: Any tree exported with "make export" or "make tarball"
 # will not require subversion. The downloadable snapshots are already exported.
-SVNVERSION := $(shell ./util/getrevision.sh -u)
+SVNVERSION := r1782
 
 RELEASE := 0.9.7
 VERSION := $(RELEASE)-$(SVNVERSION)