qt4: change download URL for qscriptclassic

The archive vanished from the previously used mirror.
libports: download location of jbig2dec

The original git:// URL produced the following error:

Cloning into 'jbig2dec'...
fatal: remote error: access denied or repository not exported: /jbig2dec.git
nitpicker: fix warning about truncated integer

warning: large integer implicitly truncated to unsigned type [-Woverflow]
libports: fix VFS config of sdl.run
base-nova: remove special Thread_base::myself()

The weak implementation was added for quite special purposes years ago
and is no longer needed. On the other hand, the weak attribute does not
help if the implementation ends up in a shared library, which first
resolves symbols locally before asking ldso (that includes the acutal
thread library) *shiver*
run: support Intel AMT wsman protocol

The older SOAP EOI protocol is not supported with AMT version 9+. By default
the wsman tool will be used if installed.

RUN_OPT examples to enforce amtool or wsman:

--target amt --amt-tool wsman
--target amt --amt-tool amttool

Fixes #1251
acpi: fix skipping over parameters of devices

Fixes lookup of pci GSI IRQ re-routing tables seen on Ultrabook Fujitsu t904.

Fixes #1250
blk_cache: correctly examine return value in write

Ref #1249
blk_cache: don't try to sync 'zero' chunks

Invalid cache entries called 'zero chunks' shouldn't be synced.

Fix #1249
Log name of exiting child from Child::exit()

Fixes #1243.
terminal: fix warning about uninitialized variable

In fact the struct member `value` was not initialized for Invalid_entry.