Modifying build flags to ensure libiwasm.so is built (#4255)

language-bindings/python/utils/create_lib.sh

@@ -17,6 +17,7 @@ cmake \
     -DWAMR_BUILD_LIB_PTHREAD=1 \
     -DWAMR_BUILD_LIB_WASI_THREADS=1 \
     -DWAMR_BUILD_LIB_WASI=1 \
+    -DBUILD_SHARED_LIBS=ON \
     ..
 make -j