Include termios.h to get struct winsize declared when building with
the Android NDK.

* subversion/svn/file-merge.c: Include termios.h to fix Android build.

Patch by: Fredrik Fornwall (fredrik at fornwall net)

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1599135 13f79535-47bb-0310-9956-ffa450edef68