MSVC's <arm64_neon.h> header contains cl.exe intrinsics that are not
recognized by clang-cl.
Contributed-by: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Contributed-by: Mike Klein <mtklein@google.com>
Signed-off-by: Cosmin Truta <ctruta@gmail.com>
Move deallocation of riffled_palette from png_write_destroy to
png_read_destroy. The reader (not the writer) is the owner of
riffled_palette.
Move allocation and initialization of riffled_palette from
png_do_read_transformations to png_init_palette_transformations.
Allow riffled_palette inside png_struct only if the ARM Neon
optimizations are enabled.
Rename png_riffle_palette_rgba to png_riffle_palette_rgba8, etc.,
to better indicate the strict applicability of these routines.
Fix an unused parameter warning in the build configurations where
riffled palette optimization is not enabled.
Fix indentation.
