Change current directory for make process. (for nmake)

[elfmimi]

As far as I know, nmake does not have equivalent of -C option. So changing current directory is required.
I used subprocess.call() with cwd named argument. But it seems this is not supported in Python 2.7 .
If support for Python 2.7 is mandatory for the project , let me know. I will rework the patch.

[0xc0170]

Hi, how to reproduce the issue to understand this patch better?

[0xc0170]

python 2.7 would be nice but we should stop supporting it anyway soon enough. It's still enabled in Travis as being tested (I assume this specific patch for nmake is not tested in Travis well)

[elfmimi]

Ah, here you are, the context. ARMmbed/DAPLink#770 (comment)

[0xc0170]

But it seems this is not supported in Python 2.7 .

As I read it, call in 2.7 should have args same as Popen (https://python.readthedocs.io/en/v2.7.2/library/subprocess.html#subprocess.Popen) so cwd should be supported. If that is the case, LGTM

[elfmimi]

oh yes, you are right. I tested and confirm that Python 2.7 call() do support cwd= argument. no problem then. :->