Construct an integer (unique to the specified BAL_VERSION_MAJOR and BAL_VERSION_MINOR numbers) corresponding to the major and minor version numbers, respectively, of the current (latest) BAL release. Note that the patch version number is intentionally not included. The exact format of the result is an implementation detail of bslscm_versiontag. The major and minor parts of the resulting version can be extracted with BSL_GET_VERSION_MAJOR and BSL_GET_VERSION_MINOR respectively.