dev-lang/spidermonkey: modernize, bump, merge

revbump/merge version 24.2.0-r3

These were all cloned from a really early implementation of the 1.8.5
ebuild before lots of things were implemented/figured-out for the
overlay.  Not only did they break (I forget how exactly, but they no
longer compiled), but they were ugly as hell, the result of having been
implemented during my brief flirtation with the idea of using ehooks for
all ebuild code (as kind-of a poor-mans multilib-minimal style, I
guess).

Anyhow this gets rid of all use of ehooks, and implements instead
multilib_src_foo phase functions as its flow control mechanism.  It also
uses the framework's wrapping features instead of some hand-coded thing.

Finally, it rejiggers the nspr hacks to work with
MULTILIB_CHOST_TOOLS-style naming (changed when the nspr ebuild was
removed downstream -- oh, right, that's what broke :) ).

All three ebuilds are modernized, and the (purportedly) permanently
masked upstream, pending removal, version, -1.8.7-r4 (-r3 upstream),
is dropped as a laziness/hassle-reduction measure (although,
technically, we should implement it in order to protect anyone unmasking
it from any worst-practices unversioned atoms, i.e.:

'dev-lang/spidermonkey:0[${MULTILIB_USEDEP}]'

Signed-off-by: Gregory M. Tuner <gmt@be-evil.net>

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