cmake: Teach --build to honor CMAKE_VERBOSE_MAKEFILE for Ninja

The Ninja build system does not support a in-file verbositiy switch.
Instead teach 'cmake --build' to extract the CMAKE_VERBOSE_MAKEFILE
setting and pass it as an optional '-v' argument to Ninja.  This can
serve as a reasonable fallback.

Signed-off-by: Gregor Jasny <gjasny@googlemail.com>

Source/cmGlobalXCodeGenerator.h

@@ -60,7 +60,7 @@ public:
     const std::string& projectDir,
     const std::string& targetName,
     const std::string& config,
-    bool fast,
+    bool fast, bool verbose,
     std::vector<std::string> const& makeOptions = std::vector<std::string>()
     );