Add sysconf names for Android
an attempt at a singleton pausible idle callback for each scheduler. suffers from nondeterministic deadlock and also pending scheduler messages on scheduler shutdown.
std::rt: Touch up idle logic
std::rt: Fix a race in UvRemoteCallback's dtor that misses callbacks

Full description in comments.
Moved the logic for a pausible idle callback into a new type - PausibleIdleCallback and placed the appropriate signatures in rtio and implementation into uvio.
A round of code cleaning for the primary scheduler code. Comments have been updated, a minor amount of support type restructing has happened, methods have been reordered, and some duplicate code has been purged.
fix for #8088 (Cannot name a struct field `new` due to ancient syntax)
remove code for parsing ancient syntax
added a run-pass test
Fix segfault when calling tuple struct constructor as extern fn

Fixes #5315
extract_grammar symnames

add missing symnames

Signed-off-by: Jan Kobler <eng1@koblersystems.de>
insert space

in the rust grammar

to avoid error messages like this:

  Exception: non-alpha apparent keyword: pub"

when using extract_grammar.py:

python2.7 src/etc/extract_grammar.py <doc/rust.md

Signed-off-by: Jan Kobler <eng1@koblersystems.de>
Fix ICE when calling static and static function pointers

Fixes #8588
Add assertions to test
Fixed -Z print-link-args
Add assertions and cross crate tests
Delete std::rt::io::net::http

It's an empty stub and as one of the comments notes, doesn't belong in
libstd.
Implement .size_hint() on new vec iterators
Update size_hint()s on std::iterator Iterators

Add size_hint() to a few Iterators that were missing it.

Update a couple of existing size_hint()s to use checked_add() instead of
saturating_add() for the upper bound.
Fix mod_floor() for uint primitive types
std::str: Bench test for char iterators
std::str: Small fix for slice