GraphicsMagick broken after libxml2 2.13.9 upgrade (missing xmlNanoHTTPCleanup)

[Cristi Diaconu]

Hello,

The recent upgrade of libxml2 from 2.10.4 to 2.13.9 breaks applications
relying on GraphicsMagick, such as Octave.

When launching octave, it throws the following Windows error dialog:
"The procedure entry point xmlNanoHTTPCleanup could not be located in the
dynamic link library C:\cygwin64\bin\cygGraphicsMagick-3.dll."

Upstream libxml2 2.13 dropped the deprecated NanoHTTP symbols. It appears
cygGraphicsMagick-3.dll needs to be rebuilt against the new libxml2 release
to resolve the missing entry point.

Windows version: Windows 11 Enterprise 25H2

Best regards,
Cristian Diaconu