Revert "suppress warning on GCC 7 and later"

This reverts commit a630ad73cb.

modules/shape/CMakeLists.txt

@@ -1,6 +1,2 @@
 set(the_description "Shape descriptors and matchers")
-if(ARM AND CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0)
-  # suppress warnings from GCC only on 7.1 and later
-  ocv_warnings_disable(CMAKE_CXX_FLAGS -Wno-psabi)
-endif()
 ocv_define_module(shape opencv_core opencv_imgproc opencv_video WRAP python)