imlib2: Update graphics/imlib to 1.5.1

pkgsrc changes:
- Remove lround patches: lround is no longer used
- Remove #ifndef blocks to rip out XShm support.  Unfortunately
  the logic is much more convoluted now and #ifndef parts of the code
  no longer scale.
  Please note that this can break support on Interix!

Changes:
1.5.1
*****
Kim Woelders (13):
 - Fix build without HAVE_X11_SHM_FD (T6752)
 - XPM loader: Fix potential use of uninitialized value (T6746)
 - BMP loader: Fix infinite loop with invalid bmp images (T6749)
 - PNM loader: Simplify (fixing ASCII format parsing issues T6751)
 - BMP loader: Fix warnings found with -O3
 - Maximum image dimension should be 32767, not 32766
 - PNG loader: Correct various error handling cases
 - Add missing const to imlib_apply_filter() script argument
 - Warning fixes in imlib2_... programs
 - imlib2_view: Limit window dimensions to 32767
 - grab.c: Fix gcc8 warning
 - imlib2_conv.c: Fix gcc8 warning
 - 1.5.1.

1.5.0
*****
Alexander Volkov (3):
 - put a check for shared memory inside __imlib_ShmGetXImage()
 - introduce __imlib_ShmDestroyXImage() instead of __imlib_ShmDetach()
 - Add support for MIT-SHM FD-passing

Kim Woelders (19):
 - XPM loader: Fix incorrect image invalidation.
 - Make some more functions static.
 - Introduce __imlib_LoadImageData()
 - Remove redundant CAST_IMAGE()
 - imlib2_grab: Always use imlib_create_scaled_image_from_drawable() to grab image
 - imlib_create_scaled_image_from_drawable(): speed up 1:1 case
 - imlib_create_scaled_image_from_drawable(): Drop shape handling if unshaped
 - Indent
 - Autofoo cosmetics
 - Strip trailing whitespace, cosmetics
 - Fix potential OOB memory access if border elements are negative
 - Fix potential OOB memory access if border sizes exceed image dimensions
 - Introduce IMLIB2_SHM_OPT to enable overriding/testing SHM modes
 - Add IMLIB2_XIMAGE_CACHE_COUNT to enable testing the ximage cache
 - Refactor the XImage cache
 - Add imlib_get_cache_used()
 - Expose XImage cache control functions
 - Drop -Waggregate-return
 - 1.5.0.

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