[misc] use the more univerasal _mm_alloc() instead of _aligned_malloc()

* Also ensure that our buffers are aligned
* Also remove the use of static buffers in ms-sys

[syslinux] fix Syslinux installation for some media

* Some disk devices, such as O2Micro PCI-E SD card readers, return ERROR_INVALID_PARAMETER
  when attempting to use ReadFile() on a volume against a non 8-byte aligned buffer.
* This patch ensures that the Syslinux buffers for sector patching are 16-byte aligned.
* HUGE THANKS to 424778940z, for the numerous testing that allowed to troubleshoot this issue.
* Closes pbatard#767

[misc] add a few more missing calloc checks

* Also use the relevant macro in msapi_utf8.h

[misc] add more check for malloc() errors

* Closes pbatard#772
* With thanks to @elfring

[syslinux] use SetFilePointerEx and other improvements

[enum] add support for O2Micro PCI-E card readers

* Part of pbatard#767

[enum] use Unicode when retrieving the device friendly name

* This should fix the improper display of some localized strings such as
  "Microsoft Virtual Disk"

[clang] fix breakage when opening ISO9660 images

* Even in MS compatibility mode, clang needs to be told how to pack structs
* Also fix a compilation warning with Link Time Code Generation

add Clang/C2 support for Visual Studio (EXPERIMENTAL)

* When I say EXPERIMENTAL, I mean it!!
* Currently, opening an ISO9660 image fails with 'Could not access directory'

[msvc] harmonize compilation options