an ugly fix to build minizip under windows( ugly, but it works for me)

If anyone can refine this, it is welcomed (see minizip/CMakeLists.txt for comments)

kicad/minizip/CMakeLists.txt

@@ -4,8 +4,14 @@ IF(ZLIB_FOUND)
 ELSE(ZLIB_FOUND)
 	MESSAGE(STATUS "Check for installed zlib -- not found")
     IF (NOT MINGW)
-	     MESSAGE(FATAL_ERROR
+		MESSAGE(FATAL_ERROR
                  "zlib was not found - it is required to build KiCad")
+	ELSE (NOT MINGW)
+		# zlib is not installed, and in this case wxWidgets creates its own zlib library
+		# include files are in ${wxWidgets_ROOT_DIR}/src/zlib
+		#and the corresponding library is libwxzlib-<version>.a ( like libwxzlib-2.8.a)
+		# and we try to use it
+		INCLUDE_DIRECTORIES(${wxWidgets_ROOT_DIR}/src/zlib)
     ENDIF (NOT MINGW)
 ENDIF(ZLIB_FOUND)
 
@@ -16,6 +22,6 @@ SET(MINIZIP_SRCS
 
 ADD_EXECUTABLE(minizip ${MINIZIP_SRCS} )
 
-TARGET_LINK_LIBRARIES(minizip ${ZLIB_LIBRARIES})
+TARGET_LINK_LIBRARIES(minizip ${ZLIB_LIBRARIES}  ${wxWidgets_LIBRARIES})
 
 INSTALL(TARGETS minizip RUNTIME DESTINATION bin COMPONENT binary)