Support building on modern MSYS2 #13
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* Source/NSSavePanel.m: Fix return type of sorting function.
…nerating COFF files. See https://reviews.llvm.org/D75989 and https://maskray.me/blog/2021-04-25-weak-symbol This would lead to linker errors like this: ``` C:/tools/msys64/ucrt64/bin/ld: obj/libgnustep-gui.obj/NSBitmapImageRep+GIF.m.o:NSBitmapImageRep+G:(.rdata+0x418): multiple definition of `.weak.__objc_class_ref_NSString.default..objc_sel_namealloc'; obj/libgnustep-gui.obj/NSAttributedString.m.o:NSAttributedString:(.rdata+0xc38): first defined here C:/tools/msys64/ucrt64/bin/ld: obj/libgnustep-gui.obj/NSBitmapImageRep+GIF.m.o:NSBitmapImageRep+G:(.rdata+0x508): multiple definition of `.weak.__objc_class_ref_NSNumber.default..objc_sel_namealloc'; obj/libgnustep-gui.obj/NSAttributedString.m.o:NSAttributedString:(.rdata+0xc20): first defined here C:/tools/msys64/ucrt64/bin/ld: obj/libgnustep-gui.obj/NSBitmapImageRep+ICNS.m.o:NSBitmapImageRep+I:(.rdata+0x400): multiple definition of `.weak.__objc_class_ref_NSData.default..objc_sel_namealloc'; obj/libgnustep-gui.obj/NSBitmapImageRep+GIF.m.o:NSBitmapImageRep+G:(.rdata+0x4f0): first defined here ```
…scussed in the documentation
…SIArrayItem and GSIArray. This issue wasn't caught by CI since gui was not recompiled after base was altered.
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