1. PR's description should state the problem which you want to resolve here.
2. "MSVC <<2017": use MSVC version check.
3. It is better to fix deprecated API usage. Code will be broken in the future.

1. Updated;
2. Added if(MSVC_VERSION LESS 1910) i.e. < visual studio 15 2017;
3. It is unreal. G-API doesn't use deprecated API. DNN module has the same warnings without disabling (C4996):
   

   opencv/modules/dnn/CMakeLists.txt

   Line 49 in 6a2077c

   ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4244 /wd4267 /wd4018 /wd4355 /wd4800 /wd4251 /wd4996 /wd4146

   .

Or am i wrong?
Do you propose to associate disabling with IE version (2022.1 release)?

The PR handles problem with Windows warnings.

Not sure if it is time to trying fix issues with OV 2021.4.0 + MSVS 2015.
Please check the latest builds, with OV 2021.4.1 + MSVS 2019. There is no such warnings anymore

BTW, https://docs.openvino.ai/latest/openvino_docs_install_guides_installing_openvino_windows.html

Install these dependencies:
Microsoft Visual Studio* 2019 with MSBuild

We need to use the right conditions.
wd4996 is used for IE builds only.
Current patch is a regression for non-IE scope.

There is no such warnings anymore
BUT

1. Warnings are reproducible on MS_BUILD of MSVS 2015 (make no sense anymore?). Builds fine with 2019 version.
2. -- Inference Engine: NO reference
   Is it normal? We won't get warnings without IE.

I will check the OV 2021.4.1 + MSVS 2019.

Warnings should be disabled through precise conditions.

For testing with MSVS 2015 / 2019 use this (one of them at once):

build_image:Custom Win=openvino-2021.4.1
build_image:Custom Win=openvino-2021.4.1-vc14

FYI, no warnings on neighbor PR against OV 2021.2.0 + MSVS2015: https://pullrequest.opencv.org/buildbot/builders/precommit_custom_windows/builds/2760

Inference Engine: NO

Fixed nightly builds, no warnings observed: https://pullrequest.opencv.org/buildbot/builders/master_openvino-win64/builds/887

I removed disabling for 4996 and built with build_image:Custom Win=openvino-2021.4.1-vc14,
received "deprecated" warnings.
Conclusion:

1. No warnings for OV 2021.2.0 + MSVS2015;
2. No warnings for OV 2021.4.1 + MSVS 2019;
3. No warnings for OV 2021.4 + MSVS 2019;
4. Warnings for OV 2021.4.1 + MSVS 2015;
5. Warnings for OV 2021.4 + MSVS 2015.

Does MSVS 2015 make sense now?

• If yes, i suggest disable 4996 warnings (like in dnn module), because gapi module doesn't use deprecated API of IE.
• If no, let's leave as it was and add check if(MSVC_VERSION LESS 1910) for C4503 instead comment.

Lets add MSVC_VERSION LESS 1910 check for MSVS 2015