Don't overwrite development book files.

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/systemd@11050 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

general.ent

@@ -3,7 +3,7 @@
 <!ENTITY releasedate     "April 7th, 2016">
 <!ENTITY copyrightdate   "1999-2016"><!-- jhalfs needs a literal dash, not &ndash; -->
 <!ENTITY milestone       "7.10">
-<!ENTITY generic-version "development"> <!-- Use "development", "testing", or "x.y[-pre{x}]" -->
+<!ENTITY generic-version "systemd"> <!-- Use "development", "testing", or "x.y[-pre{x}]" -->
 
 <!ENTITY lfs-root        "http://www.linuxfromscratch.org/">
 <!ENTITY blfs-root       "&lfs-root;blfs/">