png.c: unbreak build without JPEG support #373
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Since commit a9e228f (Implemented a private PNG caNv (canvas) chunk),
PNGsLong gets called unconditionally, but it is only defined if JPEG
support is enabled (which defines JNG_SUPPORTED), breaking the build:
MagickCore/.libs/libMagickCore-7.Q16HDRI.a(MagickCore_libMagickCore_7_Q16HDRI_la-png.o): In function
WriteOnePNGImage': png.c:(.text+0x748d): undefined reference to
PNGsLong'png.c:(.text+0x74b7): undefined reference to `PNGsLong'
For build log, see:
http://autobuild.buildroot.net/results/d20/d20eecec8e7b947759185f77a6c8e610dd7393f3/build-end.log
Fix it by unconditionally defining the helper function.
Signed-off-by: Peter Korsgaard peter@korsgaard.com