VS 6: Do not try Intel Fortran .vfproj file with msdev

Teach CMakeDetermineCompilerId to skip trying to build a .vfproj
file for Intel Fortran under Visual Studio 6.  The msdev command-line
build produces a popup error dialog that hangs the configuration.
Cygwin: Avoid legacy warnings in RunCMake.CMP0026 test

Set the minimum required version of CMake high enough to avoid the
warning for CMAKE_LEGACY_CYGWIN_WIN32.  The warning appears on stderr
and breaks the expected output matching.
Merge topic 'vs-intel-compiler'

1b7117a VS 6: Do not try Intel Fortran .vfproj file with msdev
Merge topic 'target-LOCATION-policy'

abfebef Cygwin: Avoid legacy warnings in RunCMake.CMP0026 test