Build for Visual Studio

[MonkeybreadSoftware]

Added makefile and fixed some compilation errors.

[x42]

libltc is already known to compile with MSVC (also older compilers).

You also seem to have been using an old version of libltc without git-rebasing your changes.
This pull-request undoes various recent changes to the library and hence cannot be merged as-is.

There are a few nice parts, e.g. some explicit typecasts, but I have zero interest in making this lib strict ANSI-C89 compatible in 2020. I'm sorry.

Also I have no interest in explicit .def and .rc files. I can not maintain them and this information should be automatically generated in the first place.

[x42]

I'm curious: which version of MSVC do you use that requires these changes?

[MonkeybreadSoftware]

I made changes for Visual Studio 2008.
Sorry for picking the wrong version to start.
I appreciate if you include a few of the changes in future versions.

[x42]

Odd. The library is known to build with Visual Studio 2005 (version 8) as-is.
Maybe compare to the VC Project used by Ardour: https://github.com/Ardour/ardour/blob/master/libs/libltc/MSVCltc/ltc.vcproj John Emmas succeeded to compile the lib without resorting to adding ANSI-C89 compat.

[MonkeybreadSoftware]

Oh, I build via command line, so I may have missed a switch for this.

[tp-m]

I can build master successfully with MSVC (vs2019) with my Meson build system port for what it's worth.

(Unit tests fail with MSVC, but that might be a problem with the test code or the wrapper script).