Adding secret option which *really* catches all missing requires. (#1674)

Tested and it detected goog.object was missing!

javascript/build.xml

@@ -51,6 +51,7 @@
         <arg line='-f "--jscomp_error=misplacedTypeAnnotation"' />
         <arg line='-f "--jscomp_error=missingProperties"' />
         <arg line='-f "--jscomp_error=missingRequire"' />
+        <arg line='-f "--jscomp_error=strictMissingRequire"' />
         <arg line='-f "--jscomp_error=nonStandardJsDocs"' />
         <arg line='-f "--jscomp_error=strictModuleDepCheck"' />
         <arg line='-f "--jscomp_error=suspiciousCode"' />