Bazel build rules for tclap

Follows a "repos/deps" pattern (in order to help with recursive dependencies). To use:

1. Copy bazel/repos.bzl into your repository at 3rdparty/bazel-rules-tclap/repos.bzl and add an empty BUILD (or BUILD.bazel) to 3rdparty/bazel-rules-tclap as well.

2. Copy all of the directories from 3rdparty that you don't already have in your repository's 3rdparty directory.

3. Add the following to your WORKSPACE (or WORKSPACE.bazel):

load("//3rdparty/bazel-rules-tclap:repos.bzl", tclap_repos="repos")
tclap_repos()

load("@com_github_3rdparty_bazel_rules_tclap//bazel:deps.bzl", tclap_deps="deps")
tclap_deps()

Or ... to simplify others depending on your repository, add the following to your repos.bzl:

load("//3rdparty/bazel-rules-tclap:repos.bzl", tclap_repos="repos")

def repos():
    tclap_repos()

And the following to your deps.bzl:

load("@com_github_3rdparty_bazel_rules_tclap//bazel:deps.bzl", tclap_deps="deps")

def deps():
    tclap_deps()

4. You can then use @com_github_tclap_tclap//:tclap in your target's deps.

5. Repeat the steps starting at (1) at the desired version of this repository that you want to use:

tclap	Copy bazel/repos.bzl from:
1.2.1	3ef04ec
1.4.0 - rc1	746bc97