Added gdk-pixbuf2 and libgnome-keyring dependencies.

These are required by newer versions of chrome.
Add missing changelog entry for version 1.2-1.
Update unset_var to version 1.10 from install_chrome.sh 4.70.

Additionally saved/unset/restored the LD_PRELOAD environmental
variable in unset_var.c to stop exec'ed() processes using it.
Unset LD_LIBRARY_PATH for self-calls to the google-chrome script.
Patch libstdc++ to reference local ld-linux as well.
Include libdl in preloaded compat libraries.
Changelog entry for version 1.4-1.
chrome-deps 1.4-1