Bug 1082524 - Initialize link_map. r=nfroyd

When a library fails to load with CustomElf before it's registered, the
unregistration that does happen in CustomElf's destructor uses link_map,
so it needs to be initialized.
Bug 1080998 - Build libjsctypes-test without a dependency on mozalloc or mozglue. r=jorendorff
Bug 1081682 - Make --with-ccache use --with-compiler-wrapper under the hood. r=mshal

Also, avoid removing --with-ccache from all subconfigure calls. Only remove it
from NSPR's.
Bug 1082323 - Reject pymake in client.mk. r=mshal