Fix typos in VCRuntime modulemap.

* #77351

Signed-off-by: furby™ <devs@wabi.foundation>

Author: furby-tm

stdlib/public/Platform/vcruntime.modulemap

@@ -259,7 +259,7 @@ module std [system] {
   }
 
   module any {
-    requires cpluplus17
+    requires cplusplus17
     header "any"
     export *
   }
@@ -566,7 +566,7 @@ module std [system] {
   }
 
   module spanstream {
-    requires cpluplus23
+    requires cplusplus23
     header "spanstream"
     export *
   }