gnu: valgrind: Adjust patch for glibc 2.19.

* gnu/packages/patches/valgrind-glibc.patch: s/2.18/2.19/.

gnu/packages/patches/valgrind-glibc.patch

-Accept glibc 2.18 as valid.
+Accept glibc 2.19 as valid.
+
 --- a/configure	2013-10-10 22:27:20.331223000 +0200
 +++ b/configure	2013-10-10 22:27:55.055223000 +0200
 @@ -6604,6 +6604,16 @@
  	DEFAULT_SUPP="glibc-2.34567-NPTL-helgrind.supp ${DEFAULT_SUPP}"
  	DEFAULT_SUPP="glibc-2.X-drd.supp ${DEFAULT_SUPP}"
  	;;
-+     2.18)
-+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: 2.18 family" >&5
-+$as_echo "2.18 family" >&6; }
++     2.19)
++	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: 2.19 family" >&5
++$as_echo "2.19 family" >&6; }
 +
 +$as_echo "#define GLIBC_2_18 1" >>confdefs.h
 +