Provisions for MATLAB 9.4 (R2018a)

Take into account the API break in the MEX interface (new interleaved complex API).
But do not split MEX directories on MacOS X for the time being.

(cherry picked from commit 473b2f59)

m4/ax_matlab_version.m4

@@ -22,6 +22,9 @@ AC_REQUIRE([AX_MATLAB])
 AC_MSG_CHECKING([for MATLAB version])
 if test "x$MATLAB_VERSION" != "x"; then
   case $MATLAB_VERSION in
+    *2018a | *2018A)
+      MATLAB_VERSION="9.4"
+      ;;
     *2017b | *2017B)
       MATLAB_VERSION="9.3"
       ;;

matlab/add_path_to_mex_files.m

@@ -51,7 +51,7 @@ else
                     addpath(mexpath);
                 end
             end
-        else
+        elseif matlab_ver_less_than('9.4')
             tmp = [dynareroot '../mex/matlab/win64-7.8-9.3/'];
             if exist(tmp, 'dir')
                 mexpath = tmp;
@@ -59,6 +59,14 @@ else
                     addpath(mexpath);
                 end
             end
+        else
+            tmp = [dynareroot '../mex/matlab/win64-9.4/'];
+            if exist(tmp, 'dir')
+                mexpath = tmp;
+                if modifypath
+                    addpath(mexpath);
+                end
+            end
         end
     end
     % Add OS X 64bits specific paths for Dynare Mac package

windows/dynare.nsi

@@ -103,6 +103,11 @@ Section "MEX files for MATLAB 64-bit, version 7.8 to 9.3 (R2009a to R2017b)"
  File ..\mex\matlab\win64-7.8-9.3\*.mexw64
 SectionEnd
 
+Section "MEX files for MATLAB 64-bit, version 9.4 (R2018a)"
+ SetOutPath $INSTDIR\mex\matlab\win64-9.4
+ File ..\mex\matlab\win64-9.4\*.mexw64
+SectionEnd
+
 SectionGroupEnd
 
 SectionGroup "MEX files for OCTAVE"