Update download location for GMP-5.1.0.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10080 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

packages.ent

@@ -210,7 +210,7 @@
 
 <!ENTITY gmp-version "5.1.0">
 <!ENTITY gmp-size "1,764 KB">
-<!ENTITY gmp-url "&gnu;gmp/gmp-&gmp-version;.tar.xz">
+<!ENTITY gmp-url "ftp://ftp.gmplib.org/pub/gmp-&gmp-version;.tar.xz">
 <!ENTITY gmp-md5 "69fd511e435f81a0334f14f00c7d77b3">
 <!ENTITY gmp-home "&gnu-software;gmp/">
 <!ENTITY gmp-ch5-du "39 MB">