tools: Fix copying contents of deps/npm

This fixes a platform inconsistency between BSD and GNU `cp` where
`deps/npm` would be copied into a subdirectory of `test-npm` on Linux,
but not on OS X.

PR-URL: nodejs/node#1853
Reviewed-By: Roman Reiss <[email protected]>
Reviewed-By: Johan Bergström <[email protected]>

Author: thefourtheye

tools/test-npm.sh

@@ -13,10 +13,9 @@ if [ -z $NODE_EXE ]; then
 fi
 
 rm -rf test-npm
-mkdir test-npm
 
 # make a copy of deps/npm to run the tests on
-cp -r deps/npm/ test-npm/
+cp -r deps/npm test-npm
 
 cd test-npm