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

@@ -1118,7 +1118,7 @@ def get_build_args(compiler, optimization_level: str, debug: bool, sanitize: str
     # 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 = [
@@ -1131,7 +1131,7 @@ def _extract_nmake_fields(captured_build_args: list[str]) -> T.Tuple[str, str, s
         ]
 
         defs = ''
-        paths = ''
+        paths = '$(VC_IncludePath);$(WindowsSDK_IncludePath);'
         additional_opts = ''
         for arg in captured_build_args:
             if arg.startswith(('-D', '/D')):
@@ -1141,7 +1141,7 @@ def _extract_nmake_fields(captured_build_args: list[str]) -> T.Tuple[str, str, s
                 if opt_match:
                     paths += arg[len(opt_match):] + ';'
                 elif arg.startswith(('-', '/')):
-                    additional_opts += arg + ';'
+                    additional_opts += arg + ' '
         return (defs, paths, additional_opts)
 
     @staticmethod