MSVC_NMake/README: Fix up libsigc++ .lib name.

fanc999-1 · fanc999-1 · commit f8edf1cca391 · 2022-08-17T12:01:11.000+08:00
It's always sigc-vc140-2_0.lib for Visual Studio 2015 and later.
diff --git a/MSVC_NMake/README b/MSVC_NMake/README
@@ -53,7 +53,7 @@ Building libxml++ with Visual Studio 2015 or later
  |
  -glibmm-vcXXX-2_4.lib
  |
- -sigc-vcXXX-2_0.lib
+ -sigc-vc140-2_0.lib
  |
  -gobject-2.0.lib
  |

Original file line number	Diff line number	Diff line change
`@@ -53,7 +53,7 @@ Building libxml++ with Visual Studio 2015 or later`
`53`	`53`	`\|`
`54`	`54`	`-glibmm-vcXXX-2_4.lib`
`55`	`55`	`\|`
`56`		`- -sigc-vcXXX-2_0.lib`
	`56`	`+ -sigc-vc140-2_0.lib`
`57`	`57`	`\|`
`58`	`58`	`-gobject-2.0.lib`
`59`	`59`	`\|`