Sebastiaan van Stijn fbaec0bb9e Makefile: make help: fix newline wrapping, and missing targets
This patch;

- adds support for multiple newlines
- removes the 1-space indentation of wrapped lines
- allows numerical characters in targets (0-9)

Given these targets:

```Makefile
.PHONY: foobar
foobar: ## runs the foobar lorum ipsum.\nand so pn\nand so on
	echo foobar

.PHONY: e2e-tests
e2e-tests: ## runs the end-to-end tests
	echo e2e-tests
```

Before this change, the output of `make help` was

```
foobar               runs the foobar lorum ipsum.
                      and so pn\nand so on
```

After this change, the output is:

```
foobar               runs the foobar lorum ipsum.
                     and so pn
                     and so on
e2e-tests            runs the end-to-end tests
```

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 202c9d8c98614e7cce2017f5c99d3d783fe8b509)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 733b86683f347f922affc714d305d9f03fe9b47e
Component: engine
2019-06-18 17:53:17 +01:00
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