webkit-gtk2 patches for clang/libc++

[Stefan Farfeleder]

Hi,

I managed to compile webkit-gtk2 with clang/libc++ using the following
patches:

- The first one contains the relevant bits from two upstream changes 
	http://trac.webkit.org/changeset/139553/trunk/Source/WTF/wtf/Atomics.h
	http://trac.webkit.org/changeset/139921/trunk/Source/WTF/wtf/Atomics.h

- The second one is a hack to work around the ctype.h function #defines
  which cause compilation errors because C++ headers with inline
  functions are included afterwards.

- The third and fourth are simple inclusions of missing headers.

Regards,
Stefan