MdePkg: Update Base.h to fix compilation issues with ICC.

Recent versions of the Intel C compiler define the _MSC_EXTENSIONS
constant. Base.h checks if this constant is defined to decide whether
or not to use a pragma intrinsic, which is unsupported by the latest
version of the Intel C compiler. Thus the check has been modified to
only pass in the case __INTEL_COMPILER is not defined.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

MdePkg/Include/Base.h

@@ -1027,7 +1027,7 @@ typedef UINTN RETURN_STATUS;
 #define SIGNATURE_64(A, B, C, D, E, F, G, H) \
     (SIGNATURE_32 (A, B, C, D) | ((UINT64) (SIGNATURE_32 (E, F, G, H)) << 32))
 
-#if defined(_MSC_EXTENSIONS) && !defined (MDE_CPU_EBC)
+#if defined(_MSC_EXTENSIONS) && !defined (__INTEL_COMPILER) && !defined (MDE_CPU_EBC)
   #pragma intrinsic(_ReturnAddress)
   /**
     Get the return address of the calling funcation.