Mono build disables required warning C4244 under MSVC

[GrabYourPitchforks]

In cmakelists.txt, we have:

runtime/src/mono/CMakeLists.txt

Lines 500 to 511 in 4187876

	# Decide if we need zlib, and if so whether we want the system zlib or the in-tree copy.
	if(NOT DISABLE_EMBEDDED_PDB OR NOT DISABLE_LOG_PROFILER_GZ)
	if(INTERNAL_ZLIB)
	# defines ZLIB_SOURCES
	include(${CLR_SRC_NATIVE_DIR}/external/zlib.cmake)
	else()
	# if we're not on a platform where we use the in-tree zlib, require system zlib
	include(${CLR_SRC_NATIVE_DIR}/libs/System.IO.Compression.Native/extra_libs.cmake)
	set(Z_LIBS)
	append_extra_compression_libs(Z_LIBS)
	endif()
	endif()

And in zlib.cmake, we have:

runtime/src/native/external/zlib.cmake

Lines 1 to 5 in 4187876

	if(MSVC)
	add_compile_options($<$<COMPILE_LANGUAGE:C,CXX>:/wd4244>) # conversion from 'type1' to 'type2', possible loss of data
	else(CMAKE_C_COMPILER_ID MATCHES "Clang")
	add_compile_options($<$<COMPILE_LANGUAGE:C,CXX>:-Wno-implicit-int-conversion>)
	endif()

The end result is that all of the mono native libs - not just the zlib components - are being built with C4244 disabled, which is causing binskim violations in the official build.

The mono sources should re-enable C4244 as error per SDL and binskim requirements.

See also #91245.

[GrabYourPitchforks]

May as well address this line at the same time:

runtime/src/mono/mono/mini/CMakeLists.txt

Lines 367 to 369 in 4187876

	if(HOST_WIN32)
	set_source_files_properties(${ZLIB_SOURCES} PROPERTIES COMPILE_OPTIONS "/wd4005;/wd4127;/wd4131;/wd4244")
	endif()

Of those four warnings, the only one that's mandatory to enable is C4244. Feel free to address the other warnings if you wish, but there's no requirement to do so.