Revert "explicitly set 'include' to numpy_incls (#18112)"
This reverts commit 54f2a5e91e90e35f7cbd15214297169831d6a6a6.

xref #18112

our 2.7 wheels started breaking with this: https://travis-ci.org/MacPython/pandas-wheels/builds/302788535

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=h1) Report
> Merging [#18365](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/1798c9df8144890f9d9b74cca9f3134ea523b201?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/18365/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #18365      +/-   ##
==========================================
+ Coverage   91.36%   91.36%   +<.01%     
==========================================
  Files         164      164              
  Lines       49790    49790              
==========================================
+ Hits        45489    45492       +3     
+ Misses       4301     4298       -3
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.17% <ø> (+0.02%)` | :arrow_up: |
| #single | `39.53% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.8% <0%> (-0.1%)` | :arrow_down: |
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `65.25% <0%> (+1.81%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=footer). Last update [1798c9d...fc15377](https://codecov.io/gh/pandas-dev/pandas/pull/18365?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
