[ntcoreffi] Use static runtime for ntcoreffi (#7422)

This avoids requiring users of this library to keep up to date with the latest MSVC runtimes.

ntcoreffi/build.gradle

@@ -1,3 +1,5 @@
+import org.gradle.internal.os.OperatingSystem
+
 plugins {
     id 'c'
     id 'cpp'
@@ -119,6 +121,10 @@ task cppHeadersZip(type: Zip) {
     }
 }
 
+if (OperatingSystem.current().isWindows() && !project.hasProperty('ntcoreffibuild')) {
+    return
+}
+
 build.dependsOn cppHeadersZip
 addTaskToCopyAllOutputs(cppHeadersZip)