Pass the CMAKE_TEST_MAKEPROGRAM, if any, to each test at CMake time in
the CMAKE_MAKE_PROGRAM cache entry. Pass the CMAKE_TEST_MAKEPROGRAM
into the ExportImport, Fortran, and MacRuntimePath tests so that they
may do the same for the nested project configurations.
Now "ctest --build-and-test" can get the make program from the test
build tree cache, so drop the explicit --build-makeprogram.
The ExportImport test drives its Export and Import projects using the
same compiler and flags. This converts the ctest --build-and-test
command lines to use an initial cache file instead of passing all
settings on the command line.
We need a shorter command line to pass through VS 6 on Win98.
This approach reduces duplicate code anyway.