myConfig: add ability to define HAVE_INTTYPES_H#72
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The effect of this is that the installed tkConfig.h may contain
#define HAVE_INTTYPES_H 1, which extensions can check before including <inttypes.h>.Specifically, I would like to see if there is a way to use
intptr_tanduintptr_t(from <inttypes.h>) in Tk::TableMatrix to resolve some compiler warnings using the approach common in newer Tcl/Tk C code: see asb-capfan/Tk-TableMatrix#3. But I would also need to figure out how to check forintptr_t/uintptr_t, as these types are not mandatory for inttypes.h, and Config.pm does not seem to already check for them.