Fix warnings in iOS Cross Compile CI

[waahm7]

Issue #, if available:

Description of changes:

• iOS cross compile CI is failing in aws-crt-cpp with lint warnings

     /usr/bin/clang -x c -fmessage-length\=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit\=0 -fno-color-diagnostics -Wno-trigraphs -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-return-type -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wno-unused-variable -Wunused-value -Wno-empty-body -Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-bool-conversion -Wno-enum-conversion -Wno-float-conversion -Wno-non-literal-null-conversion -Wno-objc-literal-conversion -Wshorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-implicit-fallthrough -fstrict-aliasing -Wdeprecated-declarations -Wno-sign-conversion -Wno-infinite-recursion -Wno-comma -Wno-block-capture-autoreleasing -Wno-strict-prototypes -Wno-semicolon-before-method-body -Wall -Wstrict-prototypes -Werror -Wextra -Wno-long-long -Wgnu -Wno-gnu-zero-variadic-macro-arguments @/Users/runner/work/aws-crt-cpp/aws-crt-cpp/aws-crt-cpp/build/aws-crt-cpp/build/aws-c-io.build/RelWithDebInfo-iphoneos/Objects-normal/arm64/7187679823f38a2a940e0043cdf9d637-common-args.resp -MMD -MT dependencies -MF /Users/runner/work/aws-crt-cpp/aws-crt-cpp/aws-crt-cpp/build/aws-crt-cpp/build/aws-c-io.build/RelWithDebInfo-iphoneos/Objects-normal/arm64/nw_socket.d --serialize-diagnostics /Users/runner/work/aws-crt-cpp/aws-crt-cpp/aws-crt-cpp/build/aws-crt-cpp/build/aws-c-io.build/RelWithDebInfo-iphoneos/Objects-normal/arm64/nw_socket.dia -c /Users/runner/work/aws-crt-cpp/aws-crt-cpp/aws-crt-cpp/crt/aws-c-io/source/darwin/nw_socket.c -o /Users/runner/work/aws-crt-cpp/aws-crt-cpp/aws-crt-cpp/build/aws-crt-cpp/build/aws-c-io.build/RelWithDebInfo-iphoneos/Objects-normal/arm64/nw_socket.o
/Users/runner/work/aws-crt-cpp/aws-crt-cpp/aws-crt-cpp/crt/aws-c-io/source/darwin/nw_socket.c:520:62: error: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'uint32_t' (aka 'unsigned int') [-Werror,-Wshorten-64-to-32]
        nw_tcp_options_set_maximum_segment_size(tcp_options, g_aws_channel_max_fragment_size);
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/runner/work/aws-crt-cpp/aws-crt-cpp/aws-crt-cpp/crt/aws-c-io/source/darwin/nw_socket.c:619:55: error: implicit conversion loses integer precision: 'CFIndex' (aka 'long') to 'int' [-Werror,-Wshorten-64-to-32]
        int crt_error_code = s_determine_socket_error(CFErrorGetCode(error));

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.74%. Comparing base (d8c88fe) to head (07083e6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #733   +/-   ##
=======================================
  Coverage   78.74%   78.74%           
=======================================
  Files          30       30           
  Lines        6385     6385           
=======================================
  Hits         5028     5028           
  Misses       1357     1357           

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