Some generated cm*Lexer.h headers define preprocessor macros normally
provided by <stdint.h>. The latter is included indrectly by cmMakefile.h
since commit 2268c41a (Optimize custom command full-path dependency
lookup, 2013-08-06). Adjust the order to avoid redefinition warnings.
This converts the CMake license to a pure 3-clause OSI-approved BSD
License. We drop the previous license clause requiring modified
versions to be plainly marked. We also update the CMake copyright to
cover the full development time range.