build: remove --quiet from eslint invocation

All eslint rules are configured to report as errors. Remove useless
--quiet flag from eslint invocation in Makefile and vcbuild.bat.

PR-URL: https://github.com/nodejs/node/pull/5519
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

Makefile

@@ -579,7 +579,7 @@ bench-idle:
 
 jslint:
 	$(NODE) tools/eslint/bin/eslint.js lib src test tools/doc tools/eslint-rules \
-		--rulesdir tools/eslint-rules --quiet
+		--rulesdir tools/eslint-rules
 
 CPPLINT_EXCLUDE ?=
 CPPLINT_EXCLUDE += src/node_lttng.cc

vcbuild.bat

@@ -259,7 +259,7 @@ goto jslint
 :jslint
 if not defined jslint goto exit
 echo running jslint
-%config%\node tools\eslint\bin\eslint.js lib src test tools\doc tools\eslint-rules --rulesdir tools\eslint-rules --quiet
+%config%\node tools\eslint\bin\eslint.js lib src test tools\doc tools\eslint-rules --rulesdir tools\eslint-rules
 goto exit
 
 :create-msvs-files-failed