Fix libstdc++ version

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11596 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

packages.ent

@@ -234,7 +234,7 @@
 <!ENTITY gcc-ch6-du "3.9 GB ">
 <!ENTITY gcc-ch6-sbu "92 SBU (with tests)">
 <!ENTITY libquadmath-version "0.0.0">
-<!ENTITY libstdcpp-version   "6.0.25">
+<!ENTITY libstdcpp-version   "6.0.26">
 <!ENTITY libitm-version      "1.0.0">
 <!ENTITY libatomic-version   "1.2.0">
 <!ENTITY libmpx-version      "2.0.1">