8202052: Disable warnings when building libawt with VS2017
Reviewed-by: erikj, prr
Error at func (test/nashorn/script/basic/JDK-8017950.js:33) at f (test/nashorn/script/basic/JDK-8017950.js:40) at g (test/nashorn/script/basic/JDK-8017950.js:44) at <program> (test/nashorn/script/basic/JDK-8017950.js:47)