Fix intellisense errors in genvslite projects

Standard include paths need to be added to resolve STL and platform
headers. Additionally, compiler args need to be separated by spaces, not
semicolons, in order to be recognised.

mesonbuild/backend/vs2010backend.py

@@ -1128,7 +1128,7 @@ class Vs2010Backend(backends.Backend):
     # and include paths, e.g. -
     #    '..\\some\\dir\\include;../../some/other/dir;'
     # and finally any remaining compiler options, e.g. -
-    #    '/MDd;/W2;/std:c++17;/Od/Zi'
+    #    '/MDd /W2 /std:c++17 /Od/Zi'
     @staticmethod
     def _extract_nmake_fields(captured_build_args: list[str]) -> T.Tuple[str, str, str]:
         include_dir_options = [
@@ -1141,7 +1141,7 @@ class Vs2010Backend(backends.Backend):
         ]
 
         defs = ''
-        paths = ''
+        paths = '$(VC_IncludePath);$(WindowsSDK_IncludePath);'
         additional_opts = ''
         for arg in captured_build_args:
             if arg.startswith(('-D', '/D')):
@@ -1151,7 +1151,7 @@ class Vs2010Backend(backends.Backend):
                 if opt_match:
                     paths += arg[len(opt_match):] + ';'
                 elif arg.startswith(('-', '/')):
-                    additional_opts += arg + ';'
+                    additional_opts += arg + ' '
         return (defs, paths, additional_opts)
 
     @staticmethod