fix some compilation errors on different platforms

[othiman]

Hi.
I fixed some compilation errors on Windows and Linux and added a .gitignore file to unclutter the git status command. This should at least fix #63.

I would be happy if you could include these patches into the dev branch.

Best regards,
Thomas

[dennisguse]

Cool!
It would be great if you could split up the pull request into two separate one: one for .gitignore and one for the build toolchain.
It is easier to discuss then ;)

Two minor thing:

• Almost everywhere in the code base ´#ifdef defined(unix) || defined(__unix)´ is used.
  Could you change this in the patch?
• Are the g711, pshar, and rpelt working without unistd.h?

[dennisguse]

I will work on this pull request in October.

[othiman]

Hi. I cherrypicked the PR and now only the compilation fixes are included.

[othiman]

Two minor thing:

* Almost everywhere in the code base ´#ifdef defined(**unix**) || defined(__unix)´ is used.
  Could you change this in the patch?

Where did you find the above line? I grepped the code for "unix" and most of the time "#if defined (unix)" is used. Maybe we should agree on some definition and then change it everywhere in the code to the same.

* Are the g711, pshar, and rpelt working without `unistd.h`?

I do not know. I will try out when I find some time for that.

[dennisguse]

@othiman
My fault.
It is actually: #ifdef defined(unix) || defined(__unix)
I added the asterisks as bold formatting.
In addition, the checks are at the moment not done everywhere consistently.
Sometimes, it is only defined(unix) or defined(__unix) or both.

About pshar: it will probably be removed.
g711 and rpelt would probably require some reworking to get them running without unistd.h.

[othiman]

@dennisguse I found a very nice site which addresses this issue:
http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system#HowtodetectPOSIXandUNIX

I think we should use
#if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__)))
based on the article. What do you think?

[dennisguse]

@othiman You are right - this looks better.
I created an issue for this: #91

I think this is quite some manual effort.
Therefore, I believe that this could be postpone until all tests are working.
In addition, it might be problematic that this requires changing a lot of code manually.
Thus, we might end up creating some merging issues...
Anyhow, would you like to take issue #91?

PS: Could this pull request be closed?

[othiman]

Another thing is, what platforms should be supported in the future? E.g., it seems not very reasonable to continue supporting the VMS platform. Anyhow, this PR is outdated, so I close it.