fifteen: Add glibc to update.

diff --git a/config/rootfiles/core/fifteen/filelists/armv5tel/glibc b/config/rootfiles/core/fifteen/filelists/armv5tel/glibc
new file mode 120000 (symlink)
index 0000000..4c70d72
--- /dev/null
+++ b/config/rootfiles/core/fifteen/filelists/armv5tel/glibc
@@ -0,0 +1 @@
+../../../../common/armv5tel/glibc
\ No newline at end of file

diff --git a/config/rootfiles/core/fifteen/filelists/i586/glibc b/config/rootfiles/core/fifteen/filelists/i586/glibc
new file mode 120000 (symlink)
index 0000000..943021f
--- /dev/null
+++ b/config/rootfiles/core/fifteen/filelists/i586/glibc
@@ -0,0 +1 @@
+../../../../common/i586/glibc
\ No newline at end of file