Replace existing environment variable based revision number support by a file-based method
- Generate a special header file in the build output folder with the current revision number
- Include the new header file from internal_version.h when a specific define is set
- Update create_project to define SCUMMVM_INTERNAL_REVISION as needed and add the build output folder to the include path
- Remove support for git-svn clones in the revision script (not useful anymore after the switch to git)
create_project will now use a different approach than recreating
base/internal_version.h. This is also because recreating this file might
result in accidental commits of the modified file and thus "screw up" the
version string on different systems.
svn-id: r54383
Only #define SCUMMVM_SVN_REVISION for base/version.cpp (at most), to
avoid having all source files implicitly depend on the SVN revision.
Also add a safeguard to prevent code from accidentally using the
internal header file base/internal_version.h.
svn-id: r51978
