- update to 2.1.2:
  * Fixed a regression introduced by 2.1 beta1[13] that caused the remaining
    GAS implementations of AArch64 (Arm 64-bit) Neon SIMD functions (which are used
    by default with GCC for performance reasons) to be placed in the `.rodata`
    section rather than in the `.text` section.  This caused the GNU linker to
    automatically place the `.rodata` section in an executable segment, which
    prevented libjpeg-turbo from working properly with other linkers and also
    represented a potential security risk.
  * Fixed an issue whereby the `tjTransform()` function incorrectly computed the
    MCU block size for 4:4:4 JPEG images with non-unary sampling factors and thus
    unduly rejected some cropping regions, even though those regions aligned with
    8x8 MCU block boundaries.
  * Fixed a regression introduced by 2.1 beta1[13] that caused the build system
    to enable the Arm Neon SIMD extensions when targetting Armv6 and other legacy
    architectures that do not support Neon instructions.
  * libjpeg-turbo now performs run-time detection of AltiVec instructions on
    FreeBSD/PowerPC systems if AltiVec instructions are not enabled at compile
    time.  This allows both AltiVec-equipped and non-AltiVec-equipped CPUs to be
    supported using the same build of libjpeg-turbo.
  * cjpeg now accepts a `-strict` argument similar to that of djpeg and
    jpegtran, which causes the compressor to abort if an LZW-compressed GIF input
    image contains incomplete or corrupt image data. (forwarded request 933591 from dirkmueller)

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