pixman: fix debug build

Following a suggestion by mrg.

merge pixman 0.46.4.

initial import of pixman-0.46.4

pull across a fix from upstream to fix clang builds.

https://gitlab.freedesktop.org/pixman/pixman/-/merge_requests/16/diffs?commit_id=d60b0af5e32fed034bd163d244148947d3ed91a8

Avoid undefined behavior (left-shifting negative value) in pixman_int_to_fixed

Reported in https://bugzilla.mozilla.org/show_bug.cgi?id=1580352. Casting
the argument to uint32_t should avoid invoking undefined behavior here.
We'll still have *implementation-defined* behavior when casting the result
back to pixman_fixed_t, but that's better than *undefined*.

un-merge pixman 0.42.2 and re-merge 0.38.4.

initial import of revert to pixman-0.38.4.

see arm64 neon issues, and other issues (eg, PR#57108)

Undo upstream commit b4a105d77232a87304b7b621e2f99e699a8eebd3, it breaks
colours on big endian machines. Also reported upstream.

merge pixman 0.42.2.

this reverts a local change to pixman.h as upstream have fixed it
in a different way.

initial import of pixman-0.42.2

merge for pixman 0.38.4.

initial import of pixman-0.38.4

merge libdrm 2.4.97 and pixman 0.38.0.

initial import of pixman-0.38.0

merge pixman 0.36.0.

initial import of pixman-0.36.0

update for pixman 0.34.0

merge libdrm 2.4.75 and pixman 0.34.0

initial import of pixman-0.34.0

Using defined() in a macro as condition for another #if is not portable C.

pixman_int_to_fixed is sometimes used with negative values, so do not
use left shift, but the equivalent multiplication.

clang 3.6 checks that immediate constraints for inline asm actually get
a constant expression, so use the macro version for clang.

merge pixman 0.32.6.

initial import of pixman-0.32.6

avoid using __force_align_arg_pointer__ on non-x86, where it does not exist.

turn on PTHREADS.

updates for pixman 0.32.4.

merge pixman 0.32.4.

initial import of pixman-0.32.4

merge pixman 0.30.0

initial import of pixman-0.30.0

support Loomgson Multimedia Instructions on NetBSD

pixman 0.28.2

enable altivec detection via sysctl(machdep.altivec)

Add support for SIMD and NEON extensions.

merge pixman 0.28.2

initial import of pixman-0.28.2

PIXMAN_OP_any may be stored in variables of type pixman_op_t (which
is an enum type). Change the way pixman_op_t is defined, so that
PIXMAN_OP_any is now a valid value of the enum type, instead of being
a #define'd constant that was out of range. This fixes warnings from
clang -Wtautological-constant-out-of-range-compare.

updates for pixman 0.23.2

merge pixman 0.23.2

initial import of pixman-0.23.2. important changes include:
- more SSE2 support
- more arm neon and A8 support
- several bug fixes

update for pixman 0.21.4

merge pixman 0.21.4.

initial import of pixman-0.21.4. there are a bunch of bug fixes in
here but there's no ChangeLog of what change so ...

disable sse2 on amd64 for now.

... and pull over our changes so this builds on non-amd64.

use _LP64 instead of a (broken) configure test.

update for pixman 0.21.2

merge cornflakes for pixman 0.21.2

initial import of pixman-0.21.2

Update for 0.18.4.

Import pixman-0.18.4.

Changes since 0.18.2:
Post-release version bump to 0.18.3
Fix memory leak in the pthreads thread local storage code
When storing a g1 pixel, store the lowest bit, rather than comparing with
If we bail out of do_composite, make sure to undo any workarounds.
Check for read accessors before taking the bilinear fast path
Pre-release version bump to 0.18.4

.. and pull across our changes. and turn off the poorly detected "__thread"
support...

regenerate this for pixman 0.18.2

initial import of pixman-0.18.2

Regenerate to match current source
* enable HAVE_POSIX_MEMALIGN

turn on SSE2 for amd64. from veego@.

update for 0.16.2

initial import of pixman-0.16.2

update this for 0.15.16.

merge pixman 0.15.16

initial import of pixman-0.15.16

update for new xfs, libFS, pixman, and glint/siliconmotion/tseng drivers.

merge pixman 0.15.14

initial import of pixman-0.15.14

merge pixman 0.15.10

initial import of pixman-0.15.10

Update for the 0.12.0 import

All files are now part of the pixman distribution.

File was renamed to pixman-sse2.[ch] in pixman version 0.12.0

Update to 0.12.0 for syncing with pkgsrc.

The full changes can be found here:
http://gitweb.freedesktop.org/?p=pixman.git;a=shortlog

add a bunch of generated files.

XXX mknative-xorg!

initial import of pixman-0.11.4