Changes since 8.10.2:
- relax heic is_a rules [hisham]
- fix vips7 webp load [barryspearce]
- fix out of bounds exif read in heifload
- fix out of bounds read in tiffload
- fix tiffsave region shrink mode [imgifty]
- add missing flushes on write to target [harukizaemon]
- hide info messages you could get with some older glibs [kleisauke]
- fix --no-strip on dzsave with icc-profiles [altert]
- better GraphicsMagick image write [bfriesen]
- add missing read loops to spng, heif, giflib and ppm load [kleisauke]
- block zero width or height images from imagemagick load [Koen1999]
- check for overflow in gifload height [lovell]
- fix msb_first default in ppm load and save [ewelot]
- force binary mode on win for connection read / write [Alreiber]
- better testing for output to target [barryspearce]
- ppmload_source was missing is_a [ewelot]
- improve webpload rounding and blending behaviour [lovell]
- fix range clip in int32 -> unsigned casts [ewelot]
- fix precision error in clip of float -> int casts [ewelot]
- fix load of HEIC images with 0 length metadata [ddennedy-gpsw]