Revert "sunos: unbreak build after v8 downgrade"

This reverts commit f80f3c5f62a3955636c1af1872ef9539a0b01cb0.
v8: fix postmortem and dtrace helper build

Regardless of previous @bnoordhuis' changes
http: fix case in 505 response status line

Fixes #4850.
build: automatically add tag for nightly builds
mips: fix openssl build
test: optionally set common.PORT via env variable
v8: work around String::WriteAscii segfault

See http://code.google.com/p/v8/issues/detail?id=2493 for details.

This commit reapplies 9668df8. The issue has been fixed upstream but
reappeared after last night's downgrade to V8 3.14.5 in commit b15a10e.

Conflicts:
	test/simple/test-buffer.js
v8: Hardfloat does not imply VFPv3, only VFPv2.

Raspberry Pi is an example.

BUG=v8:2393

Review URL: https://chromiumcodereview.appspot.com/11570061
Patch from Chi-Thanh Christopher Nguyen <nguyenchithanh@gmail.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13232 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

This is a backport of v8/v8@44419ad089b729a1aab4a5f27c0833e2ce69d28b.
test: merge environment, don't overwrite

The CI system requires that some environment variables are set so merge
our variables into the current environment instead of blindly replacing
it.

This will probably have to be repeated for other tests. C'est la vie.
deps: upgrade libuv to a0c1d84
core: Use a uv_signal for debug listener

Starting the debugger directly in the SIGUSR1 signal handler results in
a malloc lock contention ~1% of the time.  It hangs the test, which is
annoying on a daily basis to all of us, but it also is pretty terrible
if you actually want to debug a node process that has gone sideways.

Credit to @bnoordhuis for most of this.  I just added the unref which
keeps it from messing up the event loop for other stuff.
test: Make simple/test-debugger-client better

Handle break events that come out sometimes, by telling it to continue.
test: Fix debugger repl tests

This makes the output of simple/test-debugger-repl and
simle/test-debugger-repl-utf8 mirror an actual debugger session, so it's
a bit easier to reason about.

Also, it uses the same code for both, and fixes it so that it doesn't
leave zombie processes lying around when it crashes.

Run 1000 times without any failures or zombies.