fix Windows DLL linking problems by statically linking mingw libs (#109)

Author: slayoo

CMakeLists.txt

@@ -137,6 +137,9 @@ target_link_libraries(_PyPartMC PRIVATE partmclib)
 if (APPLE)
   target_link_options(_PyPartMC PRIVATE -Wl,-no_compact_unwind -Wl,-keep_dwarf_unwind)
 endif()
+if (WIN32)
+  target_link_libraries(_PyPartMC PRIVATE -static gcc stdc++ winpthread quadmath -dynamic)
+endif()
 
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