Resolve integer narrowing and sign mismatch warnings.
Remove extraneous symbol.
Fix forcing to/from bool warnings.
Merge pull request #820 from evoskuil/master

Remove extraneous symbol causing VC/mingw break, fix warnings.
Add missing exports to zgossip functions.
Workaround for unresolved external error in VS test builds.
Merge pull request #821 from evoskuil/master

Fix and workaround unresolved externals in VS builds.
fix mingw autoconf build

presence of "-no-undefined" seems to require dependent libraries to be
linked in.

as this file is autogenerated, someone needs to fix
"model/build-autoconf.gsl"
remove unused variable

when compiling with mingw, -Werror causes compilation to fail
fix size_t format specifier

%zd and %zu are C99, so this will still be problematic when compiling
files as C++ using Visual Studio.
Incorporate changes to src/Makemodule.am into the gsl and re-emit.
Merge pull request #822 from pijyoi/master

minor fixes for mingw autoconf build
Merge pull request #823 from pmienk/master

Incorporate changes to src/Makemodule.am into the gsl and re-emit.
Fix build on OS X, complains about variable length array folded to constant array.
Rename ZSOCK_MAX_FRAMES to ZSOCK_BSEND_MAX_FRAMES for clarity. Bring back the previous comment.
Merge pull request #827 from jossgray/master

Fix build on OS X
Problem: zbeacon.c doesn't use self->poller
Solution: Remove self->poller
Fixes #794