Intel: Fix detection of MSVC version simulated by pre-11.0 Fortran

The Intel Fortran 10 64-bit compiler incorrectly defines _MSC_VER to its
own version (1020) instead of the underlying MSVC tools version.  Since
we expect the compiler to be used only with VS >= 7 tools, assume MSVC
version 13.0 if _MSC_VER is not greater than 1300.
Merge topic 'vs-intel-compiler' into next

99f299d Intel: Fix detection of MSVC version simulated by pre-11.0 Fortran