[mono] Fix warnings on OSX, re-enable -Werror on CI with CMake (#44747)

[mono] Fix warnings on OSX, re-enable -Werror on CI with CMake (#44747)

* Ifdef out removed icalls on netcore

* Fix format string for cross builds

desc here is based on the pointer size of the target, whereas void* is based on the host

* Re-enable -WError on CI for OSX and Wasm

This got lost in the CMake transition

* Improve ep_rt_thread_id_t handling.

* Make types_str local to mono_fdhandle_insert

* Fix OSX build error.

* Align os thread id to uint64_t.

* Update src/mono/mono/sgen/sgen-descriptor.c

Co-authored-by: Aleksey Kliger (λgeek) <akliger@gmail.com>
* Update src/mono/mono/sgen/sgen-descriptor.c

Co-authored-by: Aleksey Kliger (λgeek) <akliger@gmail.com>
* Update src/mono/mono/sgen/sgen-descriptor.c

Co-authored-by: Aleksey Kliger (λgeek) <akliger@gmail.com>
* Revert "Make types_str local to mono_fdhandle_insert"

This reverts commit 04f56efcb8e9d33dca12f831f9c05591c649678c.

* Put types_str under appropriate ifdef

* Disable Werror on wasm

Co-authored-by: lateralusX <lateralusx.github@gmail.com>
Co-authored-by: Aleksey Kliger (λgeek) <akliger@gmail.com>
Co-authored-by: Alexander Köplinger <alex.koeplinger@outlook.com>