VS: Document VS_GLOBAL_KEYWORD and VS_KEYWORD relationship (#14493)

These two target properties serve the same purpose for different versions
of Visual Studio.  Document the versions covered by each property.

Reported-by: mar.na@t-online.de
Revert "Ninja: use deps = gcc/msvc feature"

This reverts commit e66df7ee65a8516ee829d3b63d6ea57e3e9ced87.

forgot to save header
Merge topic 'ninja-remove-cmcldeps-2' into next

2086ff1 Revert "Ninja: use deps = gcc/msvc feature"
Merge topic 'doc-vs-keyword-properties' into next

b9fe4b6 VS: Document VS_GLOBAL_KEYWORD and VS_KEYWORD relationship (#14493)