app: more cleanup in GimpBacktrace
Improve out-of-range check in gimp_backtrace_find_thread_by_id(). Remove unnecessary #include <exchndl.h> in gimpbacktrace-windows.c, and revert commit 644234e9 (the DrMingw detection happens at runtime). The Windows backend can work without DrMingw, it just can't find all the symbols, and doesn't provide source-location information.
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