Don't warn about multiple msvc installations when --quiet is passed,

to avoid spirious test failures.


[SVN r18476]

tools/build

@@ -1 +1 @@
-Subproject commit 5c685928a7c5eef9ef680a05530ea3989330c00c
+Subproject commit fc0aeb21b46af751082533dd9e634234799739dd