CMake Nightly Date Stamp
VS11: Fix VSExternalInclude test

Set CMAKE_SUPPRESS_REGENERATION in the Lib1 and Lib2 projects so that
their .vcxproj files do not contain references to ZERO_CHECK.  Such
references do not make sense when using the files in another .sln file.
This does not reduce the effectiveness of the test because real projects
that use include_external_msproject will have their own .vcxproj files not
generated by CMake anyway.
Merge topic 'vs11-external-include' into next

bc65b74 VS11: Fix VSExternalInclude test
c2ab74a CMake Nightly Date Stamp