squash! Start to implement a built-in version of git add --interactive

[TODO! Cherry-pick the latest changes from gitgitgadget#170]

Start to implement a built-in version of `git add --interactive`

Unlike previous conversions to C, where we started with a built-in
helper, we start this conversion by adding an interception in the
`run_add_interactive()` function when the new opt-in
`add.interactive.useBuiltin` config knob is turned on (or the
corresponding environment variable `GIT_TEST_ADD_I_USE_BUILTIN`), and
calling the new internal API function `run_add_i()` that is implemented
directly in libgit.a.

At this point, the built-in version of `git add -i` only states that it
cannot do anything yet. In subsequent patches/patch series, the
`run_add_i()` function will gain more and more functionality, until it
is feature complete. The whole arc of the conversion can be found in the
PRs #170-175 at https://github.com/gitgitgadget/git.

The "--helper approach" can unfortunately not be used here: on Windows
we face the very specific problem that a `system()` call in
Perl seems to close `stdin` in the parent process when the spawned
process consumes even one character from `stdin`. Which prevents us from
implementing the main loop in C and still trying to hand off to the Perl
script.

The very real downside of the approach we have to take here is that the
test suite won't pass with `GIT_TEST_ADD_I_USE_BUILTIN=true` until the
conversion is complete (the `--helper` approach would have let it pass,
even at each of the incremental conversion steps).

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

builtin/add.c

@@ -191,9 +191,6 @@ int run_add_interactive(const char *revision, const char *patch_mode,
 	struct argv_array argv = ARGV_ARRAY_INIT;
 	int use_builtin_add_i =
 		git_env_bool("GIT_TEST_ADD_I_USE_BUILTIN", -1);
-	if (use_builtin_add_i < 0)
-		git_config_get_bool("add.interactive.usebuiltin",
-				    &use_builtin_add_i);
 
 	if (use_builtin_add_i == 1) {
 		enum add_p_mode mode;