[Chapel Merge] Patch stb_image_write to workaround upstream bug

Branch: refs/heads/main
Revision: 642f897f955a51924dfdd33ca9a4f8eaffd04d1f
Author: jabraham17
Link: Patch stb_image_write to workaround upstream bug by jabraham17 · Pull Request #29089 · chapel-lang/chapel · GitHub
Log Message:
Patch stb_image_write to workaround upstream bug (#29089)

Patches the bundled stb_image_write header to workaround an upstream
bug: https://github.com/nothings/stb/i…ssues/1433

[Reviewed by @dlongnecke-cray ]

Compare: Comparing 310323f510263463a5d252be134921587753b673...e397494455400725d5fa7cf540f05a42ae51505f · chapel-lang/chapel · GitHub

Diff:
M modules/packages/ImageHelper/stb/README
M modules/packages/ImageHelper/stb/stb_image_write.h
https://github.com/chapel-lang/chapel/pull/29089.diff