Bug 1091383 - Move delayload logic entirely in moz.build frontend code. r=gps
Bug 1091384 - Remove EXPAND_LIBNAME and affiliated. r=mshal
Bug 1091505 - Run subconfigures in parallel. r=gps

On automation, this brings Windows configure time on a clobber from 5:30 to 3:10.

Sadly, because make needs to run under intl/icu/host before configuring
intl/icu/target, intl/icu/host needs to be configured independently. Fortunately,
that's not configured for normal windows builds anyways.

Also, having multiple subconfigures sharing the same cache file is dangerously
racy. Fortunately, not a lot do. In fact, only js/src and $_subconfigure_subdir
do, so force the latter (only used for ldap sdk on comm-central) not to
configure in parallel.