GitHub runners only checkout the particular revision that's going to be built
instead of the whole tree, which results in the revision count always being set
to 1. The short revision checksum is enough anyway.
This replaces the occurrences of the static version number with a version string
if building in a Git repository and Git is available on the build host.
This isn't perfect, since the revision is only going to be fetched when running
qmake or cmake, while it's possible that it changes between consecutive
compilations, not just reconfigurations. However, the main purpose of this is
to add a version tag to the builds built centrally by the GitHub runners, which
always configure the project from scratch.
Fixes#127.
Currently can build tsmuxer CLI and libmediation in native 64-bit
on Linux. Windows, Mac, and 32-bit untested (32-bit is mostly
a function of the user's CXX_FLAGS settings anyway).
As a consequence of trying to get it to build the correct files,
the textSubtitleRender{FT|Win32}.* files had to be moved to an
osdep/ subdirectory. Some #include cases were also fixed to
point to the correct headers and directories in the source
tree or elsewhere.
Install rules need to be fleshed out for static/shared libs and
headers for libmediation, uninstall rules need to be added.
tsMuxerGUI needs to be hooked in as well.
