Fix RealmGateway to avoid double-transforms on loopback.

Previously, in the presence of promise capabilities, a save() request could cross over the same gateway twice (or more!). Some gateways (e.g. Sandstorm's) implement one-way transformations, so this could cause the request to fail when it shouldn't.

Disable UrgentObserver test on macOS.

Fix various problems reported by `clang++ -Werror`

Fixes for windows

Fix that Thread::detach() prematurely deleted objects the thread might be using.

Fixed typos

include stdlib.h to fix build on OSX

Only Glibc on Linux has execinfo.h

Fix as done elsewhere so that it builds correctly on Musl libc
as well as Glibc.
Signed-off-by: Justin Cormack <justin@specialbusservice.com>

capnp/Request: warn on unused result for send()

Mark Builder::operator Reader/asReader() member functions const.

Add missing include when building on Linux

Add missing include when building on Linux

Discovered trying to build on Android using CMake.  UIO_MAXIOV is only
exported by the linux/uio.h header which was never included.  Not sure
how normal Linux builds work.

Add missing reinterpret cast from const void* to const byte*.

Remove -pthread compile flag when building under Android.  ANDROID cmake
variable exported by android-cmake project.

Fixes #349.

prevent use-after-free in internal compiler API

capnp-c++: implement asGeneric method for outer template contexts

Since simply fixing the bug would silently break backwards-compatibility for affected schemas, we instead throw an exception to alert developers.

See Issue #344 for more details.

https://github.com/sandstorm-io/capnproto/issues/334

fix spelling of "inundating"