/usr/src/glibc/debian/watch is in eglibc-source 2.19-0ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2
version=3 ftp://ftp.gnu.org/gnu/glibc/glibc-([\d\.]+)\.tar\.gz debian uupdate