cogl/cogl-bitmap-conversion.c: Include missed header

The cogl-texture-private.h needs to be included as
_cogl_texture_needs_premult_conversion, so that we can avoid implicit
declaration warnings of that symbol (aka C4013 on MSVC).

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 4afe9dc1fea646e2a9576f9a0dbd1ffafa40485b)
cogl-path: Add a symbols file

This is used for exporting symbols when Cogl-Path becomes a DLL (.so)
of its own, so one can use and process this file with a preprocessor for
e.g. and generate a .def file that can be used for this purpose.  Dist the
symbols file as well.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 5037d81a1c68cfa9a052b9b081187e717b59b54b)
Fix the Windows Resource Files

The autotools variables to substitute for versioning in 1.16 is wrong, so we
have incorrect versioning info during a release as the variables are for
Cogl-2.x.  Fix this so we can have the correct versioning info for the
Cogl/Cogl-Pango DLLs during a release.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
MSVC Builds: Update Predefined cogl-defines.h

Cogl-Path was split out from the main Cogl library to become a standalone
library, but many libraries/appplications using Cogl (such as Clutter)
expects that Cogl-Path is still in Cogl.  Define
COGL_HAS_COGL_PATH_SUPPORT here, as it will always be needed, at least for
the 1.16 release series, so that builds of items using Cogl would not
break, such as Clutter.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
Update cogl.symbols

Add the symbols that were added to the public Cogl API, and remove the
export of an internal API that was also removed.  Unfortunately
_cogl_system_error_quark needs to be exported for the conformance test
programs.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
cogl/cogl-offscreen.h: Fix deprecation macro placement

The deprecation macros need to be before the function prototype on
Visual Studio, and is also accepted by GCC.

Reviewed-by: Neil Roberts <neil@linux.intel.com>