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Fix mingw-w64 build

Wolfgang Stöggl requested to merge stoegglw/libgxps:2021-08-09_Fix_mingw-w64_build into master

Add common_flags and common_ldflags to libgxps/meson.build, which are required in case of mingw-w64 builds.

  • For mingw-w64 builds, COBJMACROS needs to be defined before any #include <jpeglib.h>, because jpeglib.h includes shlwapi.h, which provides a different IStream_Write and lacks IStream_Release.
    The correct include for IStream_Write and IStream_Release is objidl.h
    Fixes:
    gxps-images.c:1042:4: error: too many arguments to function 'IStream_Write'
    gxps-images.c:1058:2: error: implicit declaration of function 'IStream_Release'
  • mingw-w64 builds require linking with libwindowscodecs

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