Update ruby-faraday to 0.8.6.

no summarized changes.
Updated www/ruby-faraday to 0.8.6
Implicit int is not valid C++.
Make a few warnings non-fatal with clang.
Fix linking fdpassing.
NetBSD/current needs _KMEMUSER and a few additional includes.
Fix template lookup.
Don't use undefined bool.
Fix header to work with C++11 compilers.
Fix NPAPI detection to use correct main declaration. Fix a bunch of
C++11 issues and request it for Clang.
replace shebang for a perl script.
/usr/bin/env is not portable (ex. /bin/env for Haiku).

noticed by diger in pkgsrc-users@.
string.h is no longer included by png.h
Fix return types.
Use plain tar.
Fix return type.
Don't use nested functions to detect support for __attribute__.
Fix return types.
Fix assembler syntax.
Consistently return a value.
Always return a value from !void functions.