make additional tests optional

- Remove them from the MANIFEST as they are
  not supposed to be distributed.
remove DOCS from default target and druntime.zip

- These are the raw b&w ddoc html files that nobody uses.

- The distributed druntime docs are generated
  by dlang.org (through the doc target).
move -version=CoreDdoc to DDOCFLAGS

- DOCFMT is typically overriden when calling
  the makefile.
additional Unicode win api calls, +SwapBuffers, +ChoosePixelFormat, Pixel format descriptor enum
added missing PFD_ flags, enum type to int
Merge pull request #696 from MartinNowak/windowsAPI

add SetFileAttributes
detect other uname -m outputs

- x86_64, amd64 => MODEL:=64
- i386, i586, i686 => MODEL:32
Merge pull request #697 from MartinNowak/fixAutoMODEL

detect other uname -m outputs
Merge pull request #654 from MartinNowak/optionalTests

[2.065] make additional tests optional
core.sys.posix.fcntl: Fix F_GETLK/F_SETLK/F_SETLKW on Linux/X86_64
Merge pull request #699 from CyberShadow/fcntl64

core.sys.posix.fcntl: Fix F_GETLK/F_SETLK/F_SETLKW on Linux/X86_64
core.sys.windows.windows: Add file locking APIs
core.stdc.stdio: Add MSVCRT functions to convert between fds and HANDLEs
Merge pull request #700 from CyberShadow/windows-locks

core.sys.windows.windows: Add file locking APIs
Merge pull request #701 from CyberShadow/osfhandle

core.stdc.stdio: Add MSVCRT functions to convert between fds and HANDLEs
core.sys.windows.windows: Add ERROR_ALREADY_EXISTS
Merge pull request #702 from CyberShadow/error_already_exists

core.sys.windows.windows: Add ERROR_ALREADY_EXISTS
rt.dmain2: Fix Issue 11865 - Unhandled exception does not show crash dialog

If a console window is not present, display uncaught exceptions
in a standard Windows message box.
rt.dmain2: Use core.sys.windows.windows
Merge pull request #703 from CyberShadow/windows-crash-dialog

Fix Issue 11865 - Unhandled exception does not show crash dialog