Fix install-build-deps.sh so that it does not interpret a yes-no answer in reverse.

BUG=none
TEST=Run install-build-deps.sh, and answer "Y" to the question "Do you want me to download all packages needed to build new 32 bit package files?". It should proceed to the installation process.

Review URL: http://codereview.chromium.org/549189

git-svn-id: http://src.chromium.org/svn/trunk/src/build@37374 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

install-build-deps.sh

@@ -311,7 +311,7 @@ if [ "$(uname -m)" = "x86_64" ]; then
     echo "look for packages named *-ia32.deb."
     echo "Do you want me to download all packages needed to build new 32bit"
     echo -n "package files (Y/n) "
-    if ! yes_no 0; then
+    if yes_no 0; then
       do_inst_lib32=1
     fi
   fi