Update .gitignore for cmake generated files
After running cmake on Linux with:
```
tensorflow/tools/ci_build/ci_build.sh CMAKE tensorflow/tools/ci_build/builds/cmake.sh
```
the following file is left:
```
ubuntu@ubuntu:~/tensorflow$ git status
On branch master
Your branch is up-to-date with 'origin/master'.
Untracked files:
(use "git add <file>..." to include in what will be committed)
api_init_files_list.txt
nothing added to commit but untracked files present (use "git add" to track)
ubuntu@ubuntu:~/tensorflow$
```
This fix updates the .gitignore file so that cmake generated files
is not added with git inadvertently.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>